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

This office chair I snagged online has been a total game-changer for my workday. Seriously, it's so comfortable, I actually look forward to sitting down at my desk now. The lumbar support is just right, and the adjustable features let me dial in the perfect position. Plus, it looks pretty sharp in my home office setup. Definitely a solid purchase for anyone spending long hours seated.

Product is amazing. Great comfort for the money. Installation was quick and seamless

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.

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.

Good support to lower back .easy to assemble. Very sturdy. No heating after long time seating.

Very quick installation and very professional. The chair is quite comfortable overall. The head rest, the 4d arm rest and the back lumbar support are top noch which allows me to work easily for 6 to 8 hrs on a daily basis. Light weight but very sturdy. Really satisfied with the product and services, and would recommend to buy.

The biggest issue I faced was during installation. The Allen keys provided were of very poor quality—they literally wore out after tightening a few screws, and even the screws themselves felt cheap. I had to buy a proper Allen key from a local hardware store just to finish assembling the chair because the original ones became useless. Another disappointment was the color mismatch. I ordered black, but they sent a grey one instead. Now, coming to the actual chair: it’s super comfortable and lightweight, which makes long working hours much easier. However, in terms of durability and sturdiness, there’s room for improvement. Overall, it’s a good purchase for the comfort factor, but if we exclude their so-called “patented cushions,” the price could definitely be more reasonable.

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!