Mid Back Dual Function Ergonomic Chair with Ratchet Back Height Adjustment with Arms Mid Back Dual function Ergonomic Chair with Ratchet Back Height Adjustment with Height and width Adjustable Arms. Pneumatic Seat Height Adjustment, 360¿ Swivel. Custom Fabric Choice Free Ground Shipping (UPS / FedEx / Curbside) Ergonomic Fabric collection Part of the Work Smart series Overall Dimensions: 24.25"w x 20.5"d x 39.25"h Seat Dimensions: 20"w x 18.25"d Back Dimensions: 16.75"w x 17"h x 2.75"t Seat Height: 17.5"-21" Weight Capacity: 250