Servus Iron Duke 15" PVC Polyblend Men's Steel Toe Work Boots, Black & Gray (18801) PVC polyblend injection molded construction is seamless and 100% waterproof yet stays flexible in cold environments; easy guide along shaft to customize height Lightweight FOOT FORM contour cushion insole provides arch and heel support, and is removable, washable, and replaceable; steel shank provides additional support, reducing leg and foot fatigue Easy guide along shaft to customize height; reinforced at critical stress points for longer wear; deep angle cleated outsole prevents slips and falls on slippery surfaces Steel toe impact protection; electrical hazard rated outsole; ASTM F2413-11 M I/75 C/75 EH Recommended use: construction, oil & gas, food processing, farming & equestrian, general purpose