3-piece mobile floor seat set includes seat, seat wedge and mobile platform-type base with casters. Base includes pull strap. Seat wedge is secured to base with velcro, and seat is secured to seat wedge with velcro and can be adjusted from upright to reclining position. Large seat fits child 49-60" and 50-100 pounds. Skillbuilders® modular seating system allows for basic Feeder Seat to transform into floor sitter and mobile floor sitter. Each seat has built-in abductor, contoured interior for correct seating posture and a safety harness. Seats and seat wedges are made of molded foam that is firm yet soft to the touch, with integral waterproof coating that is easily washed for years of use.