The Low Back Mobile Chair is a positioning chair designed for use by children with neurological or physical disabilities who need lower body support. Both models include the mobile chair frame with either tilt or tilt and seat spring action, low backrest and a push handle, pads, armrests, and footboard and sandals. The seat is height- and depth-adjustable. The chair features a contoured seat and angle-adjustable backrest with pads, a hip strap that clips into the chair at a variety of positions to meet user needs, and removable armrests that are individually height- and angle-adjustable. OPTIONS: Headrest, trunk support, tray, handhold for tray, additional side pads, leg abductor, leg prompts, footboard, sandals, and pair of Wedges. SIZES: Model R622 is medium for children 42 to 55 inches tall and model R623 is large for children 53 to 72 inches tall. DIMENSIONS: The model R622 chair frame is 20 inches wide. The seat width is 14 inches with armrests. The back is 13 inches high. The seat height above the floor adjusts from 11.5 to 15.5 inches and the seat depth adjusts from 10.5 to 14 inches. The model R623 chair frame is 23.5 inches wide. The seat width is 17 inches with armrests, and the back height is 19 inches. The seat height above the floor adjusts from 15.5 to 18.5 inches and the seat depth adjusts from 15 to 20 inches. CAPACITY: The medium chair has a capacity of 150 pounds, and the large chair has a capacity of 225 pounds. COLOR: Natural wood.