BOSS Black Diamond Task Chair (B9090-BK)
- This diamond task chair is the perfect mobile seating solution for any office
- It features an extra large seat complete with wide back cushions and has an overall weight capacity of 275 pounds
- Its contoured back provides excellent spinal support, so users can get through those long days without the extra strain. Additional features include pneumatic gas lift seat height adjustment, black upholstery, and adjustable back height and depth
- For your convenience, the unit ships ready to assemble
Any questions? Ask CelesteSM will help you find out quickly.
Bring stylish comfort to your office with the BOSS Office Products B9090-BK Task Chair. Its modern design with vibrant finish* adds a touch of stylish flair to your office. The cushioned, ergonomic mid-back and extra-thick large seat provide you with the maximum support and comfort. Quickly find the perfect sitting position by adjusting the seat height. Move around smoothly and steadily with the hooded double wheel casters. Additionally, this study chair is able to withstand a weight of up to 250 pounds.
Note: *The BOSS Office Products B9090 Task chair is available in four fabric colors: Black, Blue, Burgundy, and Grey.

Superior comfortThe mid-back ergonomic task chair is perfect for anyone who works long hours behind a desk. Its soft, cushioned backrest provides the perfect level of back support, helping relieve back strain. The extra-large seat is well padded for extra comfort. You’ll never feel discomfort, even after a long period of working.
Adjustable seat heightThe pneumatic gas lift enables you to easily adjust the seat height for maximum comfort. This means you can always work in a personalized, optimized position.
Move around easilyThanks to the hooded double wheel casters, you can easily move the chair around your work area – no need to get up.
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 2 years
- Limited Warranty period (labor): 2 years
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.com's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-800-593-1888
- Support Email: info@bosschair.com
- Support Website
- View other products from BOSS Office Products





Superior comfortThe mid-back ergonomic task chair is perfect for anyone who works long hours behind a desk. Its soft, cushioned backrest provides the perfect level of back support, helping relieve back strain. The extra-large seat is well padded for extra comfort. You’ll never feel discomfort, even after a long period of working.
Adjustable seat heightThe pneumatic gas lift enables you to easily adjust the seat height for maximum comfort. This means you can always work in a personalized, optimized position.
Move around easilyThanks to the hooded double wheel casters, you can easily move the chair around your work area – no need to get up.