Mesh high-back chair features a high-strength, elastic, nylon mesh back & a fabric-upholstered seat. Two-way adjustable armrests offer black polypropylene arm coverings. Seat & back angles can adjust independently. Other functions include ratchet back, pneumatic seat-height adjustment from 18" to 21-3/4" & 360-degree swivel. The 26" diameter, five-star base is made of reinforced nylon & is equipped with 50mm hooded, dual-wheel casters for easy mobility. Weight capacity is 275 lb. Seat measures 20-9/10" wide x 21-3/10" deep. Back size is 20-7/10" wide x 24" high. Headrest is sold separately.