Teaches elementary crawling skills to children with developmental delays. The unique design properly aligns the child’s body while encouraging crawling motion and weight bearing on hands and knees. Sling provides strength, support and comfort and is height adjustable from 9 - 17" to accommodate different sized children. The body of the crawler is lightweight durable plastic and weighs approximately 20lb. (9 kg). Casters are factory installed and suitable for use on all hard floors and most carpeting. Optional arm attachments are available as an accessory to transform it into the sit and Ride ambulatory aid.