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The Boss Web Chair (B580) pairs a comfortable, professional design with practical adjustability for daily office use. The back is built with a mesh backing for breathability, while the seat is finished in solid black LeatherPlus material that holds a clean, classic appearance.
Underneath, the chair rides on a sturdy 27-inch nylon base fitted with 2-inch dual-wheel casters for a smooth roll across the floor. A pneumatic gas lift handles seat-height adjustment, and the adjustable arms let you position support where you need it. Tilt tension lets you dial in recline resistance, and an upright lock holds the back in a fixed upright position when preferred.
The chair carries a weight capacity of 275 lb. It is MAS Green Certified and meets CA TB117-2013, reflecting its material and flammability compliance.
| Back Adjustment | No |
| Arm Type | Adjustable |
| Infinite Lock | No |
| Knee Tilt | No |
| Tilt Tension | Yes |
| Pneumatic Gas Lift | Yes |
| Upright Lock | Yes |
| Seat Slider | No |
| Chair Base | Nylon 27 Inch |
| Casters | Dual Wheel Nylon 2 Inch |
| Weight Capacity | 275 lb |
| Seat dimensions | 20" W x 20.5" D |
| Back dimensions | 21" W x 28.5" H |
| Overall dimensions | 25.5" W x 27" D x 41" to 44.5" H |
| Seat height | 18"-21.5" H |
The B580 suits commercial offices that need a professional task and executive seat with adjustable arms and tilt control, and it works equally well for home-office and remote professionals who want a breathable mesh back and a clean LeatherPlus seat for a full day at the desk.
What is the weight capacity?
The chair is rated for up to 275 lb.
Are the arms adjustable?
Yes, the B580 has adjustable arms.
Can I adjust the seat height?
Yes. A pneumatic gas lift raises and lowers the seat.
Can I lock the back upright?
Yes. The chair includes an upright lock, plus tilt tension to set recline resistance.
What is the base made of?
A 27-inch nylon base with 2-inch dual-wheel nylon casters.
🚚 Free shipping within the continental United States, direct from the manufacturer.
We ship within the continental United States only. Regions outside the continental U.S. are not applicable.
Project pricing, space planning, delivery and professional installation - tell us about your space and we'll handle the rest.
Get project pricing★★★★★Chloe B.When it comes to delivering a satisfactory customer experience, the staff and owner at Miramar Office Furniture OVER-delivers.
Even with a last-minute request that was far from simple, they created the possibility to complete our order in excellence and made the entire process enjoyable.
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★★★★★Denna V.We recently got some furniture delivered and put together at our office in Miramar and the guys were so nice and polite. They were fairly quick, but I was most impressed by how helpful they were and made sure that my director of operations loved where they placed the furniture and how it looked before they left. They even offered to move it if he changed his mind. I feel like that hard to come by nowadays so thought I'd leave a comment.
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★★★★★Bobby H.Chris, Jay, and the mom of Bodhi make a great team. Chris helped me design the perfect office desk.
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★★★★★Monty M.Jay is the best. So helpful with layouts, scenario planning, etc. I highly recommend these guys!
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★★★★★Myo W.I have furnished offices for 40 people with Miramar Office Furniture as my one-stop shopping place. They have the best prices, selection and service I have found. They are always my go-to when I need anything. Sally and Urban are great to work with.
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