For treatment of hip dysplasia and dislocation and allows necessary joint motion. 100% polyester pile fabric, safety slide buckles and padded shoulder straps. Chest band and leg cuffs close with hook and loop. Child can sit, crawl or lie prone or supine. Harness need not be removed to diaper or wash infant. Instruction furnished with harness. Specify size (chest circumference): XS 11″-14″; SM 14″-17″; MD 16″-19″; LG 18 1/2″-22″.