Sierra Comfort SC-205B Ergonomic Kneeling Chair Ergonomically designed to promote correct postures. Durable wooden frame, allowing maximum support. Arched base frame allows the user to shift positions or rock back and forth when desired. Contemporary fabric and polyurethane foam providing comfortable seating. Seat Pad Dimensions: 18" x 12" / Kneeling Pad Dimensions: 18" x 11" / Weight Capacity: 200 lbs.