90-degree heel. Abrasion resistant tough-tec leather. KEEN.Dry waterproof breathable membrane. Left and right asymmetrical steel toe. Locking metal hooks and lacing eyelets. Meets or exceeds ASTM F1677-96 Mark II non-slip testing standards. Meets or exceeds ASTM F2412-11 and F2413-11 I/75 C/75 EH standards. TPU stability shank.