SierraComfort SC-300B Ergonomic Kneeling Chair, 200-Pound, Black Ergonomically designed to promote correct postures Durable steel frame, allowing maximum support Adjustable seat and frame height to fit users preference Backrest providing additional support and comfort Seat pad dimensions: 17x14 / kneeling pad dimensions: 18x9 / seat adjustment: 4 vertical range / weight capacity: 200 lbs