Servus Insulated 15" Neoprene Steel Toe Men's Work Boots (22235) Built-in 1/4" polymeric foam insulation is rated for -10 F for extra warmth; graduated boot height and expandable side gusset accommodates larger calf sizes for better comfort, flexibility and fit Triple-dipped neoprene is seamless, 100% waterproof and highly resistant to acids, chemicals and contaminants; hand-laid natural rubber base is flexible and strong, even at critical stress points Removable and washable Breathe-O-Prene insole provides shock absorption and moisture-wicking; soft, durable fabric lining is breathable, keeping feet dry V-Wave outsole provides superior traction on debris-laden terrain, and features a self-cleaning, wide-pattern tread with open side wall channels to squeegee out liquids and debris Steel toe impact protection; ASTM F2413-11 M I/75 C/75; Recommended use: farming, refining, food processing and petrochemical