Arksen PU Leather Mid-Back Office Chair Ergonomic office chair with lumbar support and pneumatic seat height adjustment Seat Dimensions: 17"(W) x 17"(D) Back Dimensions: 17"(W) x 20"(H), much wider and taller Adjustable Height For Seat: 43.5" - 47" ; adjustable height Weight Limit: 440LB; easy assembly upon arrival