Servus Iron Duke 15" PVC Polyblend Soft Toe Men's Work Boots, Black & Gray (18802) 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 Reinforced at critical stress points for longer wear; deep angle cleated outsole prevents slips and falls on slippery surfaces Resistant to degradation from agricultural chemicals, fertilizers and animal waste; ASTM F2413-11 Recommended use: construction, oil & gas, food processing, farming & equestrian, general purpose