Mesh mid-back chair features a high-strength, elastic, nylon mesh back & fabric-upholstered seat. Two-way adjustable armrests have black polypropylene arm racks. Seat & back angles can adjust independently. Other functions include ratchet back, pneumatic seat-height adjustment & 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 19-3/10" wide x 20" high.