Sierra Comfort SC-350BB Ergonomic Black Frame Black Leather Kneeling Chair Ergonomically designed to promote correct postures Durable steel frame built for maximum support Resilient PU leather cushions with 3 of foam for optimal comfort Armrests for additional support and security Four wheel casters (with lockable front wheels) 4 pneumatic seat height adjustment Five knee pad height adjustment points Three footrest bar adjustment points Seat Pad Dimensions: 14(L) x 17(W) x 3(H) Kneeling Pad Dimensions: 10(L) x 17(W) x 3(H) Backrest Dimensions: 10(L) x 16(W) x 3(H) Seat height from ground (measured from rear of seat): 20-24 (adjustable) Product Weight: 32 lbs. Weight Capacity: 400 lbs.