Belleze Mid-Back Office Chair PU Leather Ergonomic Desk, Black Polyurethane Foam Pad 50%-91% / Polyester Fiber Battting 9%-50% Imported Ergonomic office chair with lumbar support and pneumatic seat height adjustment This home office chair provides comfy all-day upper body support and fixed arms Back Dimensions: 17"(W) x 20"(H), much wider and taller; Seat Dimensions: 17"(W) x 17"(D) Overall Height 35" - 38-1/2" ; Pneumatic seat-height adjustment; dual-wheel casters Tested & Certified - Meets or exceeds all ANSI/BIFMA standards