100% waterproof, high quality, chemical-resistant polyurethane gives these boots exceptional durability. They are up to 30% lighter than most PVC and rubber steel toe knee boots, yet will lastup to three times longer. A full length sock liner, flexible upper and removable, contour insole deliver exceptional comfort. Cleated, multi-purpose outsole provides excellent slip resistance on both wet and dry surfaces. These self insulating boots keep feet warmer in the cold and cooler in the heat all while providing exceptional resistance to fat and oils. Additional features of this 15" knee boot are a 12" cutline for customizable boot height, abrasion resistance for longer life and the yellow/navy boot is EH Rated. All boots meet ASTM F2413 M I/75 C/75.