Keen PTC Slip-On Leather Non-slip rubber outsole means steady steps as it grips to dry, wet and oily surfaces. Keen CUSH memory foam and recycled polyurethane footbed offers excellent cushioning. Meets or exceeds ASTM F1677-96 Mark II non-slip testing standards. Leather upper, leather / microfiber upper lining, recycled polyurethane, cork & memory foam insole. EVA midsole, oil and slip-resistant rubber outsole.