- Onyx Orthopedic Office Chair | Patented SmartGRID seat | Adjustable Lumbar Support | Ergonomic Sitting Posture | High Back Chair | Work, Home, Study | Free Installation | Black

Excellent chair, very comfortable. Installation done on time.

The chair seems to be comfortable but I have just bought it so let’s see. The installation was quick and done well.

When you are sitting and working for long hours, if you are not careful you are bound to have medical issues. Until I had one, I continued with one of those traditional fancy chairs. After having cervical and lumbar issue, the diagnosis of which caused a lot, I started with my search for a good ergonomic chair to support my back/spine. I ordered even one for around 5k, but as soon as I opened the box, I raised a return because of poor quality. Post that I was clear that you get what you pay for... 🎁 INSIDE BOX 1x backrest 1x seat 1x locking mechanism 2x handle 1x castor and cover 1x headrest 1x gas lift 2x allen key 6x screws for handle, 3x for backrest, 4x for mechanism, 1x for headrest 2x metal bush for handle 2x plastic bushes for mechanism 1x manual (printed colored booklet, not A4 papers some have received) Dimensions: Seat: Width 480 mm , Depth 480 mm Back (height from top of seat): 510 mm Arm rest: length 240mm x with 70 mm Lumbar adjustment: 35mm Headrest/neckrest adjustment: 80 mm ➕ PROS 1. A chair with quality components and smooth mechanism 2. Be it wheels, rotation of chair, up/down movement its quite smooth 3. Gas lift mechanism is smooth, and provides ample adjustment of height (top of seat cushion from ground, with gas lift at bottom position ~450 mm, and with gas lift at top position ~570 mm) 4. Removable head rest is a plus, since if you are not comfortable with it, you can remove. 5. Backrest is made up of ~8-10 mm cushion (this is a non-mesh version where its just a mesh cloth). Even with this, you its quite breathable and comfortable for long sitting. 6. Overall chair provides good support to your spine, and helps manage cervical and lumbar pain. I am using a 1" cushion as well to increase height of neck to align it perfectly with the head rest for proper neck support. I cant say much about smartgrid, as I have not disassembled any of back rest or seat. 7. Adjustable armrest is a plus to give proper rest to arms and align position as per height of the table. 8. Versatile tilting/reclining back, with adjustable tilt tension. Tension can be loosened to make it tilt with natural tilting movement of our back. ➖ CONS 1. Since I paid quite a lot for this chair, I expected quality across elements, but the castor cover was with unfinished edges, which I had to clear using a blade 2. Better handrests could have been provided. These are a bit flimsy, and loose in the adjustable housing. Moreover, note that its hard plastic and no cushioning on the top. 3. Lumbar support is not rigid and has a lot of flexibility to it (in description its being called as firm, but its far from it). Because of that, you dont get stable lumbar support. ⚙️ USAGE SCENARIOS My height is around 5' 4" and the headrest even at its lowest position, barely aligns with my neck. So anyone with lesser height will find trouble with it, as if your head actually rests on the center of headrest and not on the top, you will soon start having neck pain. Best position will be with its center of curvature aligned to neck, with head resting on top of it to keep spine straight. In such a case, you only have the option to use the chair without neck rest. 🔨 PERFORMANCE Assembly may take anywhere between 15 mins to 60 mins depending on how proficient you are with tools I used power screwdriver for faster assembly, as machine screws are provided which have fine threads, so lots of turns to screw/unscrew 🏆 VERDICT I initially ordered a 5k chair, and the quality was pathetic. This is lives up to mark to provide good quality for the cost and provides sufficient support for long working hours. A few issues are there, but you get a good deal for the price you pay.

I brought this chair for my office work on Aug 2024. Its a comfortable chair especially for people with weak back. Everything was fine till last week when I got a lower back sprain. Upon further notice, I understood there was a problem with the chair where it was slanted to the left side. I did not notice this and worked normally which resulted in my lower back sprain. I contacted their support and they said they'll arrange a technician to check on the issue. The technician came the next day and confirmed the base of the seat is misaligned. He also informed that this will be covered under warranty. The company also notified that an update will be provided in 48 hours. Today I called their support to ask them about the update and they informed that the seat base is not covered under warranty and I need to pay another 1.5k for repairing it. For a chair which is more than 10k and with 3 years of warranty, I was not even expecting for something like this. My question is, the seat base where we sit is one of the imp areas of a chair, and if this is not covered under warranty, whats the point of having 3 years of warranty? Why are we even getting an ergonomic chair for this price? So everyone planning to get this chair, think twice before you make a purchase and clearly understand how the warranty claim is handled. If not, you'll feel cheated. A ticket has been raised again. If they don't replace this under warranty, I'll be proceeding with the last available option. Only due to this stupid warranty vows, giving this chair one star.

Chair is very good and comfortable.Delivery was on tome and installation was also within 24 hours.Nice experience.

Good and economical chair.

The The Sleep Company Onyx Chair delivers a genuinely relaxing seating experience without gimmicks. The standout feature is its lumbar support—firm where it needs to be, contoured enough to keep the lower back naturally aligned during long sitting sessions. It doesn’t collapse over time, which is where most chairs quietly fail. The seat height and overall proportions are properly calibrated. Feet rest flat on the floor, knees stay at a healthy angle, and the desk-to-arm alignment feels natural rather than forced. This matters more than flashy adjustments, and Onyx gets this basic ergonomics right. In daily use, the chair promotes relaxation without encouraging slouching. The backrest supports an upright posture while still feeling comfortable enough for extended work or reading. The cushioning strikes a smart balance—supportive, not sink-in soft—so you don’t feel fatigued after hours of use. Overall, the Onyx Chair is a solid choice if you want calm, supported sitting with dependable lumbar support and correct height geometry. It focuses on fundamentals, and that’s exactly why it works.

I’ve been using **The Sleep Company Onyx Orthopedic Office Chair** for a few weeks, and it’s been a great upgrade. The **SmartGRID technology** and **adjustable lumbar support** make long work hours much more comfortable, and the **high backrest** gives good neck and shoulder support. The **upright seating position** takes a little getting used to, but once you adjust, it feels very supportive. The **seat cushion** may seem a bit flimsy at first, yet it’s comfortable even for long sittings. The **armrests could use a bit more cushioning**, though they’re still functional and well-placed. Also, the **free assembly service arranged by Amazon** was smooth and quick. Overall, a **great ergonomic chair** with minor improvements needed but excellent comfort, support, and value for the price!