Searching for the best luxury facial bed electric? The ideal choice balances comfort, adjustability, and durability while fitting your specific professional needs. The Dir Full Electrical Medical Aesthetic Chair stands out for its versatility, making it ideal for medical settings, while the GreenLife Electric Facial Bed offers excellent value for smaller salons. A common challenge in this category is finding a model that offers both premium features and reliable build quality without overspending. Keep reading for a detailed breakdown of the top options, including their strengths and tradeoffs, so you can make an informed decision.
Key Takeaways
- The best models combine high weight capacity with smooth, multi-motor adjustability for versatile treatment positioning.
- Premium builds with durable, easy-to-clean surfaces are a hallmark of top-tier luxury facial beds.
- Many high-end beds incorporate additional features like LED lighting, independent leg adjustments, and foot controls, but these can add to cost.
- Value-oriented picks often sacrifice some features or motor smoothness but still deliver reliable performance.
- Choosing between aesthetic appeal and functional durability depends heavily on your specific treatment needs and client volume.
More Details on Our Top Picks
Dir Full Electrical Medical Aesthetic Chair Facial Beauty Bed Podiatry Doctors Office Chair with 3 Motors Ink
This chair stands out for its exceptional stability and multi-function headrest that adapts to various treatments, making it ideal for busy salons or medical offices. Compared with the Artist hand Massage Table, it offers more manual adjustments and manual/removable components, though it trades off for slightly bulkier design. Its steel frame supports up to 400 lbs, ensuring durability under heavy use, but the manual adjustments require some effort, which could slow down workflow during busy periods. The fully assembled delivery and excellent customer service make setup straightforward for professionals. Tradeoff: It’s less portable than smaller, lighter models like the SKINACT Milo 3.0. This pick is best suited to established salons or clinics needing a reliable, multi-functional chair.
Pros:- Fully assembled for immediate use
- Supports up to 400 lbs with superior stability
- Multi-function headrest with adjustable features
Cons:- Manual adjustments can be slow and require effort
- Bulkier and less portable than smaller models
Best for: Salon owners or medical professionals requiring a durable, versatile chair for frequent use
Not ideal for: Home users or small spas with limited space, due to its size and manual adjustment requirements
- Motor Control:3 motors for height, backrest, and leg-rest
- Weight Capacity:400 lbs
- Frame Material:Steel
- Assembly:Fully assembled
- Adjustments:Manual armrest, headrest, foot extension
- Size:71.25 x 35 x 33 inches
Bottom line: This chair is ideal for professionals who prioritize stability, durability, and versatility over portability.
GreenLife Electric Facial Bed – 2246BN (White)
This model makes the most sense for spas or clinics needing a sleek design with advanced safety features like an emergency switch and locking system. Compared with the Artist hand Massage Table, it offers programmable memory and LED lighting, but sacrifices some adjustability flexibility due to its fixed structure. Its ADA compliance with foot extender lowering to 19 inches makes it a good choice for inclusive settings, although the slim profile may limit weight capacity slightly. It’s fully adjustable and easy to sanitize, aligning with hygiene standards, but the manual controls may lack the precision of more advanced models. Tradeoff: It’s less portable than the SKINACT Milo 3.0. This pick is best suited for those seeking a stylish, safety-conscious treatment bed for regular use.
Pros:- Sleek modern design with hidden swivel mechanism
- Programmable memory settings with LED lights
- Fully adjustable headrest and safety features
Cons:- Limited portability due to size and fixed structure
- Adjustments may lack fine precision compared to motorized models
Best for: Spa owners or estheticians needing an ADA-compliant, stylish treatment bed with safety features
Not ideal for: Mobile therapists or home practitioners with limited space, due to its size and fixed design
- Design:Modern, sleek with hidden swivel
- Adjustability:Fully adjustable headrest
- Safety Features:Emergency switch, locking system
- ADA Compliant:Yes, with foot extender
- Lighting:Customizable LED lights
- Size:70 x 30 inches
Bottom line: This bed is best for professional environments prioritizing style, safety, and ADA compliance over portability.
Artist hand Massage Table Electric Height Adjustable Massage Bed Massage Bed Facial Bed Lash Bed for Eyelash Extensions Salon Chair (White)
This table is an excellent choice for those new to professional settings or with space constraints, offering electric height adjustment and a removable head cushion. Compared with larger, more heavy-duty options like the Drexo Full Electric Massage Table, it is less robust but easier to move and set up. Its high-density foam cushion provides comfort, yet the overall slower motors can be frustrating during quick transitions. The simple design makes it accessible for beginners, though it may not withstand the rigors of high-volume salons. The included attachments, like the paper roll holder, enhance functionality without complexity. Tradeoff: It’s less durable under heavy daily use than the Dir Medical Chair. This model suits small salons, home clinics, or students starting out.
Pros:- Electric height adjustment for ease of use
- Removable head cushion with face hole
- Includes functional attachments like paper roll holder
Cons:- Slower motors may hinder quick adjustments
- Less heavy-duty, not suited for high-volume use
Best for: Estheticians or students needing a compact, easy-to-use electric bed for occasional treatments
Not ideal for: High-volume professional clinics or spas requiring rapid adjustments and heavy-duty construction
- Motor Control:Electric height adjustment
- Weight Capacity:200 lbs
- Size:75 x 33 x 27 inches
- Material:PU foam, metal
- Assembly:No assembly required
- Color:White
Bottom line: This table is perfect for beginners or small-scale operators seeking an affordable, space-efficient electric bed.
Drexo Full Electric Massage Table with Lift, Professional Facial Bed for Estheticians, Spa & Waxing, Heavy-Duty Adjustable Massage Bed for Physical Therapy, Load1500Lbs (Black, 3 Motors)
This model excels with its heavy-duty construction supporting up to 1500 lbs and powerful 3-motor system for maximum adjustability, ideal for high-demand environments like physical therapy clinics. Compared with the SKINACT Milo, it offers more robust load capacity and lift features, but it sacrifices some quickness in motor response, as noted by users citing slow motors. Its plush 4-inch memory foam cushion enhances client comfort, while the quiet mobility with lockable casters enables easy repositioning. The fully electric adjustments make it suitable for extended treatments, though its bulkier design makes it less portable. Tradeoff: It’s designed more for stability than rapid adjustments. This pick is best for busy clinics or therapists needing maximum durability and load capacity.
Pros:- Supports up to 1500 lbs load capacity
- Three powerful motors for full adjustability
- High-quality memory foam for client comfort
Cons:- Motors are relatively slow to respond
- Bulkier and less portable than lighter models
Best for: Physical therapists or estheticians requiring a robust, high-capacity electric table for frequent use
Not ideal for: Mobile therapists or small salons with limited space, due to its size and weight
- Motor Count:3 motors
- Load Capacity:1500 lbs
- Size:45”L x 22”W x 24”H
- Material:Memory foam, PU leather
- Mobility:Lockable rubber casters
- Adjustability:Height, backrest, footrest
Bottom line: This table is best for high-volume, heavy-duty settings where durability and capacity are prioritized over quick adjustments.
Fully Electric Massage Table with Lift, 1500lbs Capacity – Professional Adjustable Facial Bed for Estheticians, Spa & Waxing, Heavy-Duty 1500lbs Capacity 2r1
This table stands out for its impressive 1500lbs weight capacity and robust construction, making it ideal for busy spa environments requiring durability. Compared with the Paddie Professional Fully Electric Spa Chair, this model offers a higher weight limit and reinforced stability, though it sacrifices some portability due to its size. The quiet remote-controlled motor allows seamless height adjustments from 54 to 80 cm, supporting practitioners of varying heights and treatment types. Its ergonomic backrest and facial hole enhance client comfort during extended sessions, but the heavy-duty steel frame and reinforced structure mean it’s less maneuverable—best for fixed setups rather than mobile use. This model favors professionals prioritizing strength and stability over ease of movement, making it perfect for high-volume salons with dedicated treatment rooms.
Pros:- Supports up to 1500 lbs for maximum durability
- Powerful, quiet 200W motor for smooth adjustments
- Robust reinforced steel frame and triangular support structure
- Adjustable backrest from 0° to 45° with ergonomic facial hole
Cons:- Heavy and less portable, challenging for mobile use
- Assembly can be complex with multiple parts and limited instructions
Best for: Estheticians and spa owners who need a durable, heavy-duty table capable of supporting multiple clients daily.
Not ideal for: Mobile therapists or small clinics requiring lightweight, easily portable tables for on-the-go treatments.
- Weight Capacity:1500 lbs
- Motor Power:200W
- Height Adjustment Range:54–80 cm
- Backrest Adjustment:0° to 45°
- Upholstery Material:PU leather
- Frame Material:Reinforced steel
- Mobility:Four lockable wheels
- Dimensions:183 cm length x 62 cm width
Bottom line: This table is best suited for established salons seeking a reliable, heavy-duty fixture that prioritizes stability and client comfort over mobility.
Paddie Professional Fully Electric Spa Chair, 3 Motor Esthetician Bed with LED Light, Motorized Height & Angle Adjustable for Facial & Medical, 550lbs Capacity, White
This pick makes the most sense for practitioners who want versatile electric controls, as it features three independent motors for height, backrest, and leg rest adjustments. Compared to the Fully Electric Massage Table with Lift, the Paddie Spa Chair offers a slightly lower weight capacity but includes LED lighting and multiple motor controls for tailored client positioning. The heavy-duty steel frame and wear-resistant PU leather ensure stability and longevity, though the assembly process is more involved with multiple packages arriving separately. Its ergonomic design with adjustable backrest and leg rest supports a variety of treatments, from facials to microblading, and the integrated LED light creates a calming atmosphere. It’s ideal for professionals who value multi-motor flexibility but are okay with a more complex setup process.
Pros:- Three independent motors for precise adjustments
- LED light creates relaxing treatment ambiance
- Heavy-duty steel frame supports up to 550 lbs
- Removable, adjustable headrest and armrest for comfort
Cons:- Requires assembly of multiple packages, complicating setup
- Limited portability due to size and weight
Best for: Small to medium-sized salons seeking an ergonomic, adjustable chair with enhanced lighting and control features.
Not ideal for: Highly mobile practitioners needing lightweight, easily transportable beds, or those on a strict budget.
- Weight Capacity:550 lbs
- Number of Motors:3
- Height Range:25.4 to 30.7 inches
- Backrest Adjustment:0° to 90°
- Material:PU leather
- Frame:Steel
- LED Lighting:Yes
- Package Count:2
Bottom line: Ideal for professionals wanting multi-motor control and lighting features in a durable, space-efficient design.
Electric Massage Table with LED Light, Adjustable Facial Bed with Foot Control for Spa, Tattoo, Waxing, and Eyelash Extension, Removable Headrest and Armrest, 90° Back & Leg Adjustment (White)
This model excels in its flexibility, offering full adjustments for height, backrest, and leg rest up to 90°, making it suitable for a wide range of treatments. Unlike the heavier Fully Electric Massage Table with Lift, this table incorporates a built-in LED light and foot control, adding convenience for busy salons that value quick adjustments and ambient lighting. The removable headrest and armrest, along with sturdy PU leather, support both comfort and ease of cleaning, but its lighter frame may compromise some stability under maximum weight—supporting up to 550 lbs. It’s best for multi-purpose use in smaller or multi-functional spaces where quick setup and adaptability matter most, though it may feel less robust compared to more heavy-duty models.
Pros:- Full 90° adjustment for backrest and leg rest
- Integrated LED light for ambiance and visibility
- Removable headrest and armrest for versatile treatments
- Foot control for hands-free adjustments
Cons:- Lighter frame may reduce stability for heavier clients
- Less heavy-duty construction than premium tables
Best for: Beauty professionals needing a lightweight, versatile table with lighting for various procedures in limited space.
Not ideal for: High-volume clinics that require maximum stability and weight support for intensive daily use.
- Max Weight Support:550 lbs
- Backrest Adjustment:up to 90°
- Leg Rest Adjustment:up to 90°
- Height Adjustment:varies
- Lighting:LED integrated
- Foot Control:Yes
- Removable Components:Headrest, Armrest
- Assembly:Yes
Bottom line: Best suited for professionals who need a lightweight, multi-functional table with ambient lighting and easy adjustments.
BarberPub Fully Electric Facial Bed with 3 Motor for Esthetician, Electric Tattoo Chair for Client, Facial Bed for Esthetician, Electric Adjustment 2751 (White)
This pick makes the most sense for estheticians and tattoo artists who want a sleek, modern look combined with full electric control over adjustments. Compared to the OmySalon Fully Electric Salon Facial Bed, it offers a similar three-motor setup but with a more contemporary, minimalist design that enhances the aesthetic of upscale salons. The heavy-duty steel base and PVC leather upholstery support up to 330 lbs, slightly less than some competitors, but it compensates with smooth, silent electrical adjustments for height, backrest, and legrest. The assembly can be challenging due to multiple parts and instructions, but the final result offers a highly functional, attractive workspace. It’s ideal for professionals who prioritize a stylish environment and multi-functionality over maximum weight capacity.
Pros:- Three-motor full electric adjustment for height, backrest, and legrest
- Modern, aesthetically pleasing design
- Supports up to 330 lbs with sturdy steel base
- Removable headrest for flexible treatments
Cons:- Assembly may be complex with multiple parts
- Lower weight capacity compared to some heavy-duty models
Best for: Estheticians, tattoo artists, and beauty professionals seeking a modern, adjustable chair with a sleek design.
Not ideal for: Practitioners requiring extremely high weight support or portability for mobile setups.
- Weight Capacity:330 lbs
- Motor Count:3
- Adjustment Range:Height, Backrest, Legrest
- Material:PVC leather
- Frame:Steel
- Design Style:Modern
- Assembly:Required
- Color:White
Bottom line: This chair is perfect for stylish, versatile use in professional settings where appearance and adjustability are priorities.
BarberPub Fully Electric Facial Bed with 3 Motor for Esthetician, Electric Tattoo Chair for Client, Facial Bed for Esthetician, Electric Adjustment 2751 (White)
This pick makes the most sense for estheticians and tattoo artists who want a sleek, modern look combined with full electric control over adjustments. Compared to the OmySalon Fully Electric Salon Facial Bed, it offers a similar three-motor setup but with a more contemporary, minimalist design that enhances the aesthetic of upscale salons. The heavy-duty steel base and PVC leather upholstery support up to 330 lbs, slightly less than some competitors, but it compensates with smooth, silent electrical adjustments for height, backrest, and legrest. The assembly can be challenging due to multiple parts and instructions, but the final result offers a highly functional, attractive workspace. It’s ideal for professionals who prioritize a stylish environment and multi-functionality over maximum weight capacity.
Pros:- Three-motor full electric adjustment for height, backrest, and legrest
- Modern, aesthetically pleasing design
- Supports up to 330 lbs with sturdy steel base
- Removable headrest for flexible treatments
Cons:- Assembly may be complex with multiple parts
- Lower weight capacity compared to some heavy-duty models
Best for: Estheticians, tattoo artists, and beauty professionals seeking a modern, adjustable chair with a sleek design.
Not ideal for: Practitioners requiring extremely high weight support or portability for mobile setups.
- Weight Capacity:330 lbs
- Motor Count:3
- Adjustment Range:Height, Backrest, Legrest
- Material:PVC leather
- Frame:Steel
- Design Style:Modern
- Assembly:Required
- Color:White
Bottom line: This chair is perfect for stylish, versatile use in professional settings where appearance and adjustability are priorities.
SKINACT Sage Electric Spa Treatment Table Massage, Facial Bed (White)
This model stands out for its combination of high-quality materials, full adjustability, and elegant design, making it a versatile choice for professional spas. Unlike the Electric Lift Back Massage Table, which emphasizes ergonomic adjustability, the SKINACT Sage offers a more refined aesthetic with natural wood accents and plush padding, ideal for high-end treatment rooms. Its three motor system provides smooth height, backrest, and central module adjustments, but the tradeoff is a heavier weight of 200 lbs, making it less portable. The fully assembled design simplifies setup, and the 4-inch padding ensures client comfort during longer sessions. However, the lack of a tilt back feature limits its versatility for certain treatments.
Pros:- Elegant, natural wood finish adds a luxurious touch
- Three motor system offers comprehensive adjustability
- Fully assembled for quick setup
- High client weight capacity of 330 lbs
Cons:- Heavy weight reduces portability
- Limited tilt back capability may restrict some treatments
Best for: Estheticians seeking a premium, stylish treatment table with reliable adjustability and comfort
Not ideal for: Practitioners needing ultra-lightweight or highly portable beds for mobile services
- Length:79.5 inches
- Width:31 inches
- Height Range:23″ to 37 inches
- Padding Thickness:4 inches
- Weight:200 lbs
- Max Client Weight:330 lbs
Bottom line: This bed makes the most sense for upscale spas that prioritize aesthetics and full adjustability over portability.
BarberPub Fully Electric Facial Bed with 3 Motor for Esthetician, Electric Tattoo Chair for Client, Facial Bed for Esthetician, Electric Adjustment 2751 (Black, Height (Flat): 25.2″–37″)
This pick makes the most sense for professionals who need a versatile, fully electric bed capable of handling multiple procedures, from facials to tattooing. Compared to the SKINACT Sage, which offers more traditional spa aesthetics, the BarberPub model emphasizes full electric control, including height, backrest, and legrest adjustments, making it ideal for dynamic treatment environments. The sturdy steel frame supports up to 330 lbs, and its PVC leather covering is easy to clean, essential for multi-use settings. Yet, the weight of 150 lbs and bulkier design can hinder quick repositioning, especially in smaller rooms. The removable headrest adds flexibility but may require extra care during cleaning.
Pros:- Full electric adjustment for height, back, and legrest
- Sturdy construction supports up to 330 lbs
- Removable headrest for versatile treatments
- Easy-to-clean PVC leather surface
Cons:- Heavy weight and size reduce mobility
- Requires assembly and careful maintenance
Best for: Estheticians or tattoo artists needing a multi-purpose, fully adjustable treatment bed
Not ideal for: Mobile practitioners requiring lightweight, easily transportable beds for on-the-go services
- Height Range:25.2 to 37 inches
- Backrest Tilt:about 65°
- Legrest Tilt:about 80°
- Material:PVC leather
- Max Client Weight:330 lbs
- Weight:150 lbs
Bottom line: This bed is perfect for busy clinics that prioritize full electric control and multi-use flexibility over portability.
Electric Lift Back Massage, Spa, and Treatment Table | Adjustable Height and Backrest | ADA Compliant | 2 Year Warranty | Foot Control
This model excels in providing ergonomic adjustments for a variety of treatments, especially with its quiet German motors and foot control, which allows seamless operation. Unlike the SKINACT Sage, which focuses on aesthetics and plush padding, this table emphasizes functionality and ease of use, supporting diverse procedures from massages to medical spa treatments. Its 450 lbs weight capacity and heavy-duty steel frame ensure stability during vigorous use, while the 73-inch length and 30-inch width accommodate most clients comfortably. The inclusion of a face cradle and side armrests enhances versatility, but its bulkier profile makes it less suitable for small or mobile setups. The plush 3-inch cushioning adds comfort but may not match the high-end feel of the SKINACT’s padding.
Pros:- Quiet, smooth electric motors for height and backrest adjustment
- Heavy-duty steel frame with 450 lbs capacity
- Includes face cradle and side armrests for versatility
- Built-in mobility with polypropylene wheels
Cons:- Heavier and less portable than lighter models
- More mechanical complexity may require maintenance
Best for: Massage therapists and medical spa professionals who need a durable, highly adjustable table with smooth operation
Not ideal for: Practitioners seeking a lightweight, portable table for frequent transport or small treatment rooms
- Length:73 inches
- Width:30 inches
- Height Range:17 to 39 inches
- Weight Capacity:450 lbs
- Upholstery:Polyurethane
- Warranty:2 years
Bottom line: This table is ideal for busy professionals who value durability, full adjustability, and smooth operation over lightweight portability.
How We Picked
Each product was evaluated based on key factors such as motor smoothness, weight capacity, build quality, ease of adjustment, and versatility in treatment positions. We prioritized models with multiple motors for precise control and stability, as these are essential for professional use. Durability and ease of cleaning were also critical, since these beds are used heavily in busy settings. Additionally, we considered price-to-feature ratios to ensure options cater to different budgets, but always favoring those with proven reliability and manufacturer support. The rankings reflect a balance of performance, durability, and value for various professional environments.Factors to Consider When Choosing Best Luxury Facial Bed Electric
Selecting the right luxury electric facial bed involves more than just features; understanding your specific treatment needs and workspace constraints ensures you choose a model that offers both comfort and longevity. Here are key factors to consider that can help you make the best investment for your practice.Motor Power and Smoothness
Look for beds with multiple motors that allow independent adjustments of the backrest, leg rest, and height. This ensures precise positioning and stability during treatments, which is vital for client comfort and practitioner control. Cheaper models with a single motor or less smooth operation may cause jerking or uneven adjustments, impacting both safety and professionalism. Investing in a bed with high-quality motors means fewer mechanical issues and longer lifespan.
Build Quality and Materials
The overall durability of a facial bed depends on the frame and surface materials. Premium models often feature sturdy steel frames and easy-to-clean, stain-resistant surfaces like vinyl or faux leather. These materials not only resist wear over time but also maintain a professional appearance. Avoid beds made with flimsy materials or surfaces that are difficult to disinfect, as these can compromise hygiene and longevity.
Adjustability and Versatility
High-end beds should offer a wide range of adjustable features, including backrest angles, leg rest positions, and height settings. Some models include independent leg adjustments or LED lighting, which enhance treatment versatility. Consider your typical treatment types—if you perform lash extensions or facials, easy access and multiple angles will improve workflow. Be wary of beds with limited adjustments, which may restrict your service offerings.
Size, Portability, and Storage
Evaluate your space constraints and whether mobility matters. Larger, heavy-duty beds provide stability but can be difficult to move, while more compact models are easier to reposition but may sacrifice some stability or features. Foldable or lightweight designs can be beneficial if you need to reconfigure your workspace frequently. Make sure the size and weight align with your clinic’s layout and your handling capacity.
Additional Features and Accessories
Features like built-in LED lighting, removable headrests, armrests, and foot controls can enhance the treatment experience. While these features add convenience, they often increase cost. Consider which extras genuinely improve your workflow and client comfort, and avoid paying for bells and whistles that won’t be used regularly. Also, verify compatibility with existing equipment or accessories you might already own.
Frequently Asked Questions
Can I use a luxury facial bed for medical treatments or only for spa services?
Many luxury facial beds are designed for both aesthetic and medical use, especially those with higher weight capacities and adjustable features. Beds like the Dir Full Electrical Medical Aesthetic Chair are built to support medical procedures, including dermatology or physical therapy. Always verify the specifications to ensure the model meets medical standards if needed for your practice, as some beds are primarily intended for beauty treatments only.
What is the typical weight capacity I should look for in a luxury facial bed?
A reliable luxury facial bed should support at least 550 pounds, especially if you plan to use it for a variety of treatments or clients of different sizes. Higher capacities, such as 1500 pounds, are common in heavy-duty models and offer extra durability and stability. Choosing a bed with sufficient weight capacity reduces the risk of mechanical issues and enhances safety during use.
Are electric facial beds easy to clean and disinfect?
Most quality electric facial beds feature surfaces made from easy-to-clean materials like vinyl or faux leather, which resist stains and can be disinfected quickly. Their design typically minimizes crevices where dirt can accumulate. Proper cleaning protocols should be followed to maintain hygiene standards, especially in busy clinics. Avoid beds with porous or textured surfaces that can harbor bacteria, as they are harder to sanitize effectively.
Is it worth paying more for beds with advanced features like LED lighting or independent leg adjustments?
Investing in advanced features depends on your treatment offerings and workflow preferences. LED lighting can improve visibility during detailed procedures, and independent leg adjustments add versatility for various client positions. These extras can increase costs but may enhance client comfort and improve treatment efficiency. Consider whether these features align with your practice’s needs before opting for the most feature-rich models.
How important is motor smoothness and noise level in choosing a facial bed?
Motor smoothness directly impacts the client’s comfort and the practitioner’s control over positioning. Quiet operation is also beneficial in maintaining a relaxing environment, especially in spa settings. Beds with high-quality, smooth motors tend to be more reliable and produce less mechanical noise, which can reduce client anxiety. Prioritizing these aspects can lead to a more professional and calming treatment experience.
Conclusion
For those seeking the best overall experience, the Dir Full Electrical Medical Aesthetic Chair offers robust features suitable for both medical and beauty treatments. If budget is your main concern, the GreenLife Electric Facial Bed provides solid performance at a more accessible price point. The Artist Hand Massage Table makes sense for practitioners who need adjustable versatility without the premium price. For premium, feature-rich options, beds with independent leg adjustments and LED lighting are ideal. Beginners or small clinics may prioritize lighter, more portable models, while established practices should consider durability and extensive adjustability. Your choice should align with your specific treatment style, budget, and space constraints.
