Ergonomic design provides relief from backaches, tension and muscle strain. 100% nylon upholstery over 2-1/2" padded seat and back cushions gives firm support. Seat is 19"D x 19"W and back is 18" sq. Pneumatic 24 - 29-1/4"H seat height adjustment. Heavy duty adjustable footrest supports legs and feet. Five blade base for maximum stability. Easy-rolling 2" dual disc casters for complete freedom of movement. Easy assembly.