Propet Women's OrthoWalker III Sandals Internal heel counter stabilizes the foot. Removable insole makes room for full-length orthotics. Durable, slip-resistant polyurethane outsole provides shock absorption. Three adjustable hook-and-loop straps provide a custom fit. Leather or nubuck upper, neoprene upper lining and sockliner, leather insole, polyurethane outsole.