Extended-height mesh chair features black mesh fabric back, a black polyester fabric seat and a footring, Comfortable, ergonomic, height adjustable seat is designed for all-day comfort and prevents fatigue, Chair holds up to 250 lb, Seat height adjusts pneumatically from 23"" to 33"", Seat size is 18"" wide x 17-1/2"" deep, Back measures 17"" wide x 15-1/2"" high, 25"" five-star base has 2"" hooded dual-wheel carpet casters, Loop arms are sold separately, Chair meets applicable ANSI/BIFMA standards, SKU: SPRCH28355