This mesh back drafting stool from Office Star features an Air Grid screen mesh material on the backrest for maximum ventilation and temperature control. Other features include a thick foam padded seat cushion with stain resistant mesh fabric upholstery, built in lumbar support, one touch pneumatic seat height adjustment, 360-degree swivel, height adjustable chrome foot ring and a durable nylon five star base with dual wheel casters. Height adjustable arms available for a minimal charge. Dimensions: Seat Size: 20"W x 19.75"D x 3.5"Thick. Back Size: 19.75"W x 17.75"H x 1"Thick. Seat adjusts from 27.5" to 32.5"H. Limited lifetime warranty from Office Star. These mesh drafting chairs normally ship within 2-3 business days from our CA warehouse.