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

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

The build quality feels premium with sturdy materials and smooth adjustment mechanisms. The height adjustment, recline, and armrest settings all function effortlessly. The fabric/foam quality is also impressive, giving a plush and durable feel.

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!

The chair is great for its fast installation and comfort, allowing you to sit for 2 to 3 hours comfortably before needing to take a break. However, the armrest pads feel a bit hard, and the tilt angle is limited to around 100 degrees. The lumbar support and headrest are fixed, which might not suit everyone’s preference. Considering these limitations, the chair is somewhat costly, but it still offers good basic support and ease of use

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'm loving my new chair! The seat is so comfy, and the adjustable lumbar support is perfect for my back. The mesh backrest keeps me cool, even on long workdays. It's sturdy, stylish, and super customizable. Highly recommend for anyone seeking comfort and support!

Quality of chair is very good. Free installation also went smooth.

The chair is comfortable for long working hours and provides good back support. The build quality feels sturdy, and the design looks modern. Assembly was simple and instructions were clear. The cushioning is decent, though it could have been a bit softer for extra comfort. Overall, it’s a good value for the price, just missing a little refinement that would make it a perfect 5-star product.