Polyurethane Knee boots are the ideal combination of durability and comfort. 100% waterproof, high quality, chemical-resistant polyurethane gives these boots exceptional durability. Up to 30% lighter than most PVC and rubber knee boots, yet will last up to three times longer. Cleated, multi-purpose outsole provides excellent slip resistance. Seemless construction is 100% liquid proof. Resistant to fats and oils, fuels, bleach, industrial salts, manure, mild acids, and alkalis. Self-insulating keeps feet warmer in cold and cooler in heat. Meets ASTM F2413-18.