The steel toe Mt Vernon 8" Work Boot provides protection along with extra ankle support and enduring comfort. This waterproof boot is made with KEEN.DRY technology that lets vapor out without letting water in. Hydrophobic/hydrophilic 2-zone comfort lining. Direct attach PU midsole. Integrated PU heel cushion. Removable metatomical dual density EVA footbed. KEEN.Grip oil and slip resistant non-marking rubber outsole meets or exceeds ASTM F1677-96 Mark II non-slip testing standards. Electrical hazard protection meets or exceeds ASTM F2412-11 and F2413-11 I/75 C/75 EH standards. Not compatible with aftermarket insoles or orthotics.