SierraComfort SC-210B Ergonomic Kneeling Chair, 200-Pound, Black Ergonomically designed to promote correct postures Lightweight steel frame allows for ease of portability Contemporary fabric and polyurethane foam providing comfortable seating Adjustable seat and frame height to fit users preference Seat pad dimensions: 16"x12"/kneeling pad dimensions: 17"x14"/seat adjustment: 4" vertical range/weight capacity: 200 lbs.