Rated for 24/7 use. Back has ample support and ergonomic shaping to provide comfort and reduce fatigue; breathable nylon mesh keeps you cool and comfortable throughout every workday?no matter how many hours you put in. Solid construction supports up to 500 lbs. Recommended Applications: General Office & Task; Specialty?Big & Tall, 24/7; Seat/Back Color: Black; Arms Included: No; Pneumatic Seat Height Adjustment: Yes.