High-Back Plastic / Acrylic Office Chairs

Black

This ergonomically designed chair is specifically tailored for prolonged sitting, precisely conforming to the body's curves to distribute pressure and alleviate fatigue. The lumbar support is height and depth adjustable for precise lumbar support; the thickened armrests offer height and angle adjustments to relax the arms, shoulders, and neck. The sturdy frame, combined with highly elastic and breathable mesh fabric, provides a cool and comfortable feel, preventing stuffiness even after extended sitting. Easy to install, it's suitable for various settings including office, study, and entertainment, making it an ideal choice that combines comfort and durability.

I spend about 8 hours a day at my desk, and this Inbox Zero chair has been brilliant for my back. The 8cm thick seat cushion is really comfortable, and the breathable mesh keeps you cool even during long afternoons. I love that the lumbar support adjusts for depth and height, and the flexible armrests are a life-saver for my neck and shoulders. It is rock solid, glides quietly on my flooring, and looks great in the room. Well worth the money!. Anonymous. Sun Aug 02 2026

White

Sit well, and think better. The high-back office chair offers adjustable headrest angle and height, overall chair height adjustment, and lockable recline angle, as well as flip-up, movable, and fully adjustable multifunctional armrests, catering to a more personalized experience for individuals ranging from 1.6m to 2m in height.

I love this chair! It was easy to put together and the back part felt really good on my back. It is honestly hard (in my opinion) to get chairs online because there are so many factors. Like the height of the back where your head goes if you sit back, what happens to the chair if you lean back etc. This was 10/10 in every category and the fact that it was comfortable too was a major plus.. Lynn. New Hope, PA. Sun Dec 10 2023

Black

This HOMCOM office chair is a great addition to any home office. A comfy chair: filled with foam padding, with supportive armrests and adjustable height for support. Five 360° wheels allow this chair to be moved around easily, whenever, complete with a swivel seat which moves in motion with your body.

Very comfortable chair, great lumbar support, perfect in my home office. Adrienn. Swindon, GB. Mon May 11 2026

Grey

Ergonomic Leather Office Chair, Modern Design with Armrests & Casters, Adjustable Height, 360° Swivel, Supports Up to 150kg (Brown (Silver frame))

Excellent chair, easy to assemble and very comfortable. Mrs. Cheadle Hulme, GB. Tue Jul 07 2026

Black, Black

Bring comfort back to basics with this Vinsetto executive office chair. It has all the classic features you would expect: a high back, a wide seat, high armrests and a thick padded seat, which allows you to sit comfortably while working. Adjust the height between 116-126cm - set to a position of your choice. Swivel computer chair is finished with a large padded headrest for support.

My daughter loves it, plus is very comfortable. Anonymous. Tue Apr 30 2024

Black, Black

As a professional furniture supplier, we are committed to providing customers with more comfortable and stylish chair.In order to better apply the concept of ergonomics to furniture products, we have established a dedicated furniture design team. We designed this ergonomic office chair that can be adjusted independently and integrates several functions, to achieve the best balance between people and office chairs.Inbox Zero chair for adults helps you improve your sitting posture and work effectively, it is the best choice for a home office chair.

You get what you paid. Comfortable.. Anonymous. Fri Apr 03 2026

Beige

In everyday office life, at home office, or during a long gaming session: Sitting long every day for most people. That can quickly go on your back. To ensure that you are perfectly up to the challenge, we offer the practical executive chair with a massage function. The soothing vibration massage pampers your body while working. Thanks to the integrated heating, your muscles loosen a little faster. The office chairs are available in different colours and are made of high-quality synthetic leather. This not only looks chic but is also particularly easy to care for. Apart from that, the head chair is ergonomically shaped and height-adjustable. Even without massage and heating, you can manage your everyday life effortlessly.

Brilliant Great price easy to assemble And extremely comfortable. Sarah. Huddersfield, GB. Mon Jan 09 2023

Create a welcoming and efficient home office with the Ascend Black Mesh Ergonomic Office Chair, designed to support you through extended periods at your workstation. This practical chair features a breathable mesh back that allows air to circulate, keeping you comfortable during busy days filled with emails, meetings, or creative projects. Its compact structure fits seamlessly into cosy corners or shared spaces, with a robust polypropylene frame that supports up to 120kg, ensuring reliability for everyday use in home studies or working from home. The seat, filled with responsive foam, provides cushioning that adapts to your body for sustained comfort, while the built-in ergonomic curves encourage healthy posture for your spine and neck. Easily adjust the height between 72cm and 82cm to keep your feet planted firmly on the ground, and when not in use, the foldable backrest tucks under standard desks to save precious room in compact homes. Equipped with smooth double plastic wheels, it moves effortlessly across carpets or wooden floors, allowing quick repositioning to suit your routine.

Grey, White

Make working all day comfortable and easy, thanks to this Vinsetto office chair with footrest. The tall back and armrests offer support<br/> the back reclines back to a maximum 160° - paired with the manual footrest, you can rest back and relax whenever. Padded for comfort, it comes with a top and back pillow for extra support and comfort. Complete with five wheels to move this pc chair around easily.

Decent chair that does the job. The footrest in particular was the key selling point here because my fiancé prefers to sit cross-legged on her chair, so needed the extended area offered by the footrest to do so. Obviously you get what you pay for at this price point. The chair is not the most comfortable chair on the market, or the most ergonomic, but you'd have to spend three times the price to get that. For what this is, it is comfortable enough. And I will say that when fully reclined with footrest deployed, I could have slept in it too. This chair was also good value without including the gimmicky massage features I saw in similar price point chairs. Assembly was easy if you can follow simple picture directions. I wish Mayfair wouldn't use Evri as their courier but my issues are with Evri there, not with Mayfair or their supplier.. George . Manchester. Wed Apr 02 2025

Grey

We are committed to creating home office desk chairs that best fit the curves of the human body. Our mesh chairs have gone through several studies and constant testing to design the optimal the comfort of the high back computer chair based on a dynamic numerical model of the human body for optimal comfort. Easily adjust the headrest, armrest, seat height, and footrest to make working comfortably at home a breeze.

Actually what I was looking for.. Sheron. GB. Tue Apr 28 2026

Black

Work time will always be worth it with this massage office chair from Vinsetto. It's formed into an oversized square shape, filled with thick sponge for comfort like no other. There are 4 vibration points on the back and 2 on the seat, controlled by the attached remote. The comfortable desk chair features swivel and height adjustable seat, fixed armrests and tall back with extra padding on the head area. Your best choice for working and relaxing in the home office with the comfy chair.

Excellent product the actual build of the chair has very good appeal factor, the instructions very easy to assemble. Overall the price range is excellent value for money.. Anonymous. Fri Jan 09 2026

Brown

Upgrade your workspace with this stylish and comfortable office chair! Designed for maximum support, its high back and spacious sponge-filled seat alleviate fatigue from long working hours. The curved PP armrests enhance comfort, while the sturdy nylon base ensures stability. Effortlessly adjust the seat height with the simple pneumatic control, and recline up to 105 degrees to relieve back pressure. Whether for daily work or gaming sessions, this chair provides exceptional support and comfort. Experience a perfect blend of ergonomics and modern design for a more productive and enjoyable day.

Dark Grey

Pairing style with comfort, this executive chair is a great fit for the office or anyone working from home. Available in a choice of colours to suit your existing décor, the chair's contemporary design features lumbar support, swivel adjustability, height adjustability, and more, along with a stylish look with a textured back. Wheel castors allow you to move it easily around the home.

Incredibly comfy chair, relatively simple to build. Would definitely recommend!. Anonymous. Mon Oct 11 2021

Grey

Complete your workspace with this George Oliver stylish computer chair. It's wrapped in faux leather upholstery, with comfortable foam padding and breathable mesh on the back. Adjust the height between 44-54cm; sit at a level you want. Five smooth wheels make this comfortable office chair an easy piece to move around, whenever.- Faux leather upholstery is stylish, smooth and easy to clean; - Adjustable seat height of high back office chair: 44-54cm; - Tilt function is relaxing; - Swivel seat with five wheels: desk chair moves around easily; - PU castors are quiet and secured for floors with hardwood, laminate, tile, slate, etc.; - Thick sponge padding is comfortable, with high back and armrests for support; - Maximum load 120kg, assembly required.

Beautiful chair but quite tricky to assemble the last part by yourself. Overall, very good chair.. Bethan Eleanor Lloyd. Denbigh, GB. Fri Mar 14 2025

One of our most popular high back mesh chairs features a fully reclining tilt mechanism lockable in the upright position - adjustable to suit the individual's bodyweight (tension control), folding arms, an AIRFLOW mesh seat, posture contoured mesh back and a stylish black shell with sturdy matching 5 star base. It will provide you with comfort and style for any desired purpose.

White

Ergonomic Office Chair with Footrest Heavy Duty up to 226kg,Flip-Up Armrests, Thick Padded Seat, Adjustable Headrest, Cross-Legged Sitting Desk Chair, Swivel Computer Chair for Home Office

Red

Available in a range of colours to suit any room's existing décor, this office chair puts emphasis on comfort and style. A breathable mesh back and airflow mesh seat keeps you cool during a long day's work, and the folding arms and gas lift along with a lockable tilt mechanism allows you to customize the chair so it suits you and your working style. Assembly is required.

Love these chairs. Team love them and great it is available in our colours.. Anonymous. Harrogate, GB. Tue Nov 02 2021

Brown

Unwind and relax - even during the work day, with this office chair. It features a 155° reclining back and manual footrest, so you can lie back and elevate the lower body as you work. Thick padding means plenty of comfort, wrapped in scratch-resistant faux leather so it looks good every day. Complete with five wheels to move around easily.- 155° reclining back, with footrest. Easy to relax the whole body during the work day; - Scratch-resistant pet-friendly leather. Smooth and stylish, always looks good. Is easy to wipe clean; - 13  cm double-layer foam padding for lots of comfort; - 46-54 cm adjustable height to work at the level you want; - 360° swivel seat moves in motion with your body; - Strong, reinforced metal base with five wheels to move around easily; - Maximum load 120 kg, assembly required; - Material: Pet-Friendly Leather, Foam, Plastic, Metal, Multi-Layered Board; - Overall Dimension: 66W x 72D x 113-121H cm; - Reclined Dimension: 66W x 151D x 89-97H cm; - Seat Size: 53W x 50D x 46-54H cm; - Backrest Size: 52W x 67H cm; - Seat/Back Thickness: 13 cm; - Armrest Size: 44L x 7W x 66H cm; - Footrest Size: 35L x 21W x 5D cm; - Weight Capacity: 120 kg; - Suitable Height: 185 cm; - Item Label: 921-933V70GY;

Nice affordable. Maaz. Sat Dec 06 2025

White, Grey

This mesh office chair is brimming with style and practicality. The contemporary color palette and streamlined silhouette bring a dash of Scandinavian-inspired style into the home, while the ergonomic build keeps you sitting comfortably as you work, study, or create. It is available in a choice of colors to suit your existing décor.

Evans. Enfield. Mon Dec 30 2024

Vinsetto Massage Office Chair with Lumbar Heating Computer Desk Chair White

Emily. Bury St. Edmunds, GB. Mon Aug 03 2026

Black

Adjust office comfort your way. This Vinsetto chair comes in a fully flexible design: look to the lumbar support which moves up/down and forwards/backwards, along with the headrest which rotates and moves up/down; pair this with the adjustable tension and 43-51cm seat height. It's comfortable too, thanks to the padded seat and mesh back. Complete with five wheels, this swivel chair moves around easily.- 43-51cm adjustable seat height. Match with your desk level; - Lumbar support moves up/down and forwards/backwards. Helps relieve low back pressure; - Headrest rotates and moves up/down; - Padded seat for comfort, with a mesh fabric back to keep cool; - Flip-up armrests, so chair tucks under desks easily; - Five wheels: chair moves around easily on different floors and surfaces; - Maximum load 120kg, assembly required;- Material: Mesh (Polyester), PP, Foam, Nylon; - Overall Dimension: 62W x 64D x 112-120H cm; - Seat Size: 50 x 50 cm; - Seat Height: 43-51 cm; - Back Size: 50 x 56 cm; - Weight Capacity:120 kg; - Item Label: 921-688V70WT;

A bit challenging to put together but comfortable. Angela. New York, NY. Tue Mar 11 2025

Beige

This multifunctional office chair is the perfect addition to any professional or home workspace. Upholstered in a high-quality chenille fabric, it combines comfort with style. The chair features padded armrests and an adjustable headrest, reducing neck pain, along with a swivel base and a pneumatic seat for ease of movement and height adjustment. The built-in footrest helps improve blood circulation, while the reclining backrest that can be locked in any position provides much-needed relief for a stiff back, making it ideal for long hours of work.

Brown

Was a fantastic chair, wheel have come off after a couple years of moderate use. Charlie. Northallerton, GB. Sat May 02 2026

Dark Blue

Vinsetto Ergonomic Mesh Office Chair with 90° Flip-up Armrests, Black

Very good value, nice design and comfortable. My grandson very happy. Anonymous. Fri Apr 17 2026

Black, Black

Transform your workspace with the office chair for home, designed for utmost comfort. Enjoy the luxury of adjustable lumbar support and a rotatable headrest tailored to your needs. Wrapped in breathable mesh and plush high-density foam, this office chair with footrest offers a reclining function with a footrest, ensuring long-lasting comfort in any home office or bedroom.- Height-adjustable lumbar support enhances comfort during long working hours; - Headrest adjusts rotatable, up/down and detaches for personalised neck support; - High-density foam padding provides superior seat comfort; - Breathable mesh fabric reduces sweating and overheating; - Reclining feature from 90° to 135° with extendable footrest; - Swivel wheels and seat allow easy mobility and rotation; - Seat height adjusts smoothly with class-three gas lift; - Assembly required;- Colour: Black; - Material: Mesh (100% Polyester), Plastic; - Overall Dimension: 62W x 62D x 116-128Hcm; - Reclining Dimension: 62W x 62D x 116-128Hcm; - Seat Size: 50W x 50D x 45-57Hcm; - Armrest Height to Seat: 24cm; - Back Size: 47Wx 73Lcm; - Weight Capacity: 120kg; - Item Label: 921-816V70BK;

Brown

You get good quality furniture with good comfort, made in a stylish and modern design. We sell our furniture at really good and competitive prices. Create your own personal style in your home with new furniture. Combine the furniture with other small furniture or chic home accessories. They are with the fashion and the new home trends as you see them in magazines and journals. You will find unique, chic, and comfortable furniture. The furniture is all in a trendy design.

Black

Only had the chair 2 days and couldnt be happier.So comfortable, fits in my back like it was made for me. Lovely colour orange to.. Loraine. Harlow, GB. Sun Dec 04 2022

Black

Our reliable triple lever task operator chair features a posture curved seat with waterfall front and is fitted with an under-seat skirt. It also offers a synchronous adjustment mechanism and independent seat tilt. The backrest is contoured and sculpted with integrated lumbar support. The chair is certified to BS EN 1335 Level 3, and a robust gaslift provides easy seat height adjustment. It also offers easy back height, back rake and back tilt adjustment and is finished with stylish fixed hoop arms and a black 5 star base.

Black

Discover the comfort of the ergonomic chair, a must-have office chair for home office setup. Enjoy customisable support with a headrest and lumbar support that adjusts to your preferred positions. Wrapped in breathable mesh and high-density foam, it's the great swivel chair to enhance your productivity and comfort. Suitable as a desk chair for home office or bedroom.- Ergonomic headrest adjusts and rotates for optimal neck support; - Lumbar support moves forward, backward, up and down for back comfort; - High-density foam padding offers enduring seat comfort; - Breathable mesh fabric keeps you cool during long hours; - Flip-up armrests provide space flexibility and ease of movement; - Tilt function allows rocking back and forth for relaxation; - Swivel wheels and seat enhance mobility around the workspace; - Adjustable seat height accommodates various user sizes;- Colour: Black; - Material: Mesh Cloth (100% Polyester), Foam, PP; - Overall Dimension: 62W x 62D x 110-127Hcm; - Seat Size: 50W x 50Dcm; - Seat Height: 40-50cm; - Back Size: 46W x 70Lcm; - Weight Capacity: 120kg; - Item Label: 921-818V70BK;

Arrived quite quickly. The tilt does not work. The lift handle is loose. The back rest lifts up and down, but the screw to keep it in place doesn't tighten. These three parts come as already assembled, so I don't think it is linked to me putting the sit together. It looks like its made from cheap plastic. The only thing that works is that it goes up and down. You only realise that once you have taken an hour assembling it, and need to take another hour to disassemble. I hope Wayfair offers to pick up the parcel as part of their return policy. I would recommend to buy an alternative.. Melanie. London, GB. Sat Jan 03 2026

Brown

This big and tall executive office chair is professionally structured for larger users, featuring a heavy-duty metal base and an oversized thickened seat cushion that supports up to 181 kg. Built with independent spring system and high-density molded foam, the super-wide seat delivers sofa-like elastic comfort, while the ergonomic high backrest fully supports the neck and spine to relieve long-sitting fatigue. It comes with multi-adjustable functions, including 90 to 135 degree reclining backrest, 49.8 to 59.9 cm adjustable seat height, retractable footrest and smooth 360 degree swivel casters. It supports flexible postures for working, gaming and napping, perfectly fitting home, office, conference and reception scenarios for all-day comfortable use.

Black/Blue

One of our most popular high back mesh chairs features a fully reclining tilt mechanism lockable in the upright position - adjustable to suit the individual's bodyweight (tension control), folding arms, an AIRFLOW mesh seat, posture contoured mesh back and a stylish black shell with sturdy matching 5 star base. It will provide you with comfort and style for any desired purpose.

Black

Great chair, very comfortable and the canvas from the back is more durable than it looks in the photo. Assembly took about 30 mins.. Anonymous. Glasgow, GB. Tue Apr 13 2021

Black/Blue

Complementing its task chair counterpart but by no means inferior, this contemporary designer visitor chair boasts folding arms, an AIRFLOW mesh seat, posture contoured mesh back with stylish black shell and a sturdy 35mm tubular black frame.

Very comfortable chair. Relatively easy to put together as chair parts and fixings labelled on a fitting instructions sheet.. Anthony. Tysoe Warwick, GB. Thu Feb 20 2025

Grey

Elevate your workspace with this executive office chair, blending sophisticated style and supreme comfort! Its high back and generously padded seat, featuring integrated lumbar support, provide exceptional comfort and alleviate strain during extended work or gaming sessions. The elegantly curved PP armrests offer enhanced relaxation, while the robust nylon base guarantees unwavering stability. Effortlessly adjust your seating position with the pneumatic lift, and recline up to a luxurious 135 degrees for ultimate back pressure relief. Embrace peak ergonomics and refined design for a truly productive and enjoyable experience.

Pink, Mesh

This swivel chair not only impresses with its refined and trendy design. It supports you when working at the desk with its ergonomic design and provides additional support in the lumbar area.

Einfach zufrieden mit dem freundlichen Service danke. Martin. Wed Aug 28 2024

Grey

Easy to assemble and very comfortable.. Martyn Wardle. Newcastle Under Lyme. Thu Jun 12 2025

Gray

This oversized high-back executive chair adopts reinforced steel frame and premium top-grain leather, supporting up to 550 lbs and fitting users up to 6.5ft tall. It features a wide extra-padded seat and high-density foam for all-day sitting comfort. Equipped with Class-3 gas lift for 4-inch height adjustment, silent 360° swivel casters and 130° lockable recline with retractable padded footrest, it meets work, gaming and resting needs. The breathable wear-resistant leather is easy to clean, and full accessories support quick assembly for home and office use.

Set up a comfortable home office with the Lumo Black Mesh Ergonomic Office Chair, designed for everyday tasks such as working from home or after-school homework in your study. Its breathable mesh backrest pairs with a padded foam seat to provide reliable support during prolonged sitting, while the adjustable headrest delivers targeted neck relief. The integrated lumbar mechanism fine-tunes lower back positioning to promote alignment, and height-adjustable arms allow for personalised comfort. Mounted on a swivel base with smooth-rolling casters, this chair glides easily across your floor and tucks neatly beneath desks, ideal for shared family spaces or the home office. Enjoy smooth reclining with the Lumo chair's synchronised tilt function, which locks securely to relieve spinal strain after extended periods of typing or reviewing documents. The robust five-star base handles up to 120kg for dependable stability, and the gas lift enables swift seat height adjustments to accommodate various users. In its understated black hue, the chair integrates seamlessly into contemporary or classic home settings, with the mesh construction ensuring good ventilation to stay fresh during warmer afternoons. Quick assembly in less than 15 minutes gets you back to productivity fast, all while fostering upright posture and minimising tiredness from rigid seating.

Green, Green

This modern home office chair combines comfort with a clean, contemporary design, making it ideal for everyday use. The breathable mesh backrest promotes airflow, while the padded fabric seat provides lasting comfort throughout the working day. Featuring height adjustability, a smooth swivel function and a tilting mechanism, it adapts easily to your preferred seating position.

Blue

Ergonomic, contemporary design chair, a chic and comfortable addition to a study or home office. The tilting backrest and adjustable seat height allow you to adjust the chair to perfectly suit your needs. The high back designed with a headrest ensures a healthy posture when sitting for long periods. The seat and back are thickly upholstered and covered in hard-wearing and comfortable polyester.

The sleek silhouette of this desk chair adds a modern highlight to any home workspace. As comfortable as it is stylish, the chair features lumbar support, a tilt mechanism, and an adjustable height, allowing you to truly make the chair your own. Assembly is required.

Overall great chair, benefits are the adjustable arm rests and inclination BUT the back support is too short and head rest isnt adjustable which is a real shame. Gabriel. London, GB. Sun May 03 2020

Gray

This ergonomic mesh office chair is built with premium breathable nylon mesh on backrest and cushion for real time heat dissipation and long hour sitting coolness. Designed with S shaped high back and waist support, it corrects sitting postures and relieves back fatigue. Equipped with 90 degree flip up armrests, it can be tucked under desks to save extra space. The chair supports 4 inch pneumatic height adjustment and smooth 360 degree rotation with silent floor friendly PU casters. Complete installation tools and detailed instructions allow easy assembly within 10 to 15 minutes, suitable for offices, bedrooms, studies and living rooms for daily use.

Grey, Black

High-density moulded foam seat

Work in style from this desk chair, which adds a striking silhouette to its surroundings as well as offers a versatile piece you can make your own. The ergonomic build will support you throughout the day, while a reclining tilt mechanism and seat height adjustment allow greater control over the chair. Assembly is required.

Chair was easy to put together 10-15 minutes. Instructions were clear. Delivery took 2 days. Box wasn’t too heavy. Chair itself is comfortable, and helps maintain good posture when working. Back rest isn’t that much adjustable so that’s something to keep in mind. Position remains pretty much the same.. Daugirdas. London, GB. Sun Apr 18 2021

Ergonomic High-Back Mesh Office Chair – Superior Comfort for Home & OfficeExperience superior comfort and support with our high-back ergonomic office chair, designed to enhance productivity and well-being in your workspace. Whether you’re working, gaming, or studying, this chair adapts to your needs for lasting comfort and professional style.Advanced Ergonomic Support: Features a breathable mesh back and a 4-level adjustable lumbar support system, sliding up to 6cm to perfectly fit your spine and reduce back fatigue during long hours of sitting. The 2D adjustable headrest offers tailored neck support for all-day comfort.Customizable Comfort: Adjust the seat height (45.5cm–53.5cm), headrest, armrests, and tilt/recline function to suit your body and workspace. A high-density foam seat cushion ensures a Soft seating experience while maintaining healthy posture.Built to Last: Constructed with a heavy-duty, chrome-plated metal base and reinforced nylon frame, this chair supports up to 136kg (300lbs) for exceptional durability and stability. Smooth-rolling wheels and a 360° swivel design provide easy, quiet mobility on any surface.Space-Saving Design: Turnover-up armrests let you easily slide the chair under your desk to maximize your floor space when not in use.Modern & Versatile: Sleek black frame and transparent mesh back blend seamlessly into home offices, gaming setups, or corporate environments.Easy Assembly & Support: Includes all necessary tools and clear instructions for quick setup. Our responsive customer service is always ready to help.Upgrade your workspace with this ergonomic office chair—perfect for computer work, meetings, or gaming. Invest in comfort, health, and productivity today!

Brown

comfortable and as per description. Juhi. GB. Tue Jun 02 2020

Black, Black

Comfortable, thick seat and armrests relieve pressure. Adjustable headrest and lumbar support ensure that individual seating needs are met. High-quality, thick spring-back seat cushions ensure that your body remains relaxed even after long periods of sitting. Quiet wheels allow smooth, noiseless movement so that others in shared rooms are not disturbed. A seat weight capacity of 300 pounds ensures that it meets normal working and living requirements.

Our medium back 3 lever mesh chair packs quite a punch at a great price. Along with its mesh back it features height adjustable arms, fixed lumbar support, and a cantilever base