This mesh drafting chair from Office Star features an Air Grid screen mesh upholstery on the backrest for maximum support and ventilation. Other features of this stool include built in lumbar support, thick foam padded seat cushion upholstered in breathable mesh fabric, pneumatic seat height adjustment, 360 degree swivel, height adjustable chrome finish footring and a heavy duty chrome finish arched base with dual wheel carpet casters. Optional adjustable arms available for this model. This drafting stool meets or exceeds ANSI/BIFMA standards. Dimensions: Seat Size: 20"W x 19.75"D x 3.5"Thick. Back Size: 19.75"W x 17.75"H. Seat Height: 27.5" - 32.5"H. Overall: 51"H x 21.25"W x 25.5"D. Weight: 37 lbs. Limited lifetime warranty from Office Star. This chair normally ships within 2-3 business days from our CA warehouse.