These boots are insulated with 400g Thinsulate for extra warmth and comfort. They feature ESR-TESTER ANSI-Z41 PT99 protection to help prevent electric shock hazards. The slip-resistant, oil-resistant rubber outsole ensures steady traction. A padded collar and tongue reduce irritation while providing additional cushioning. Seam-sealed waterproof construction and a waterproof membrane keep your feet dry. The RBar provides maximum stability, and the nylon shank enhances both stability and flexibility. The removable footbed offers advanced cushioning and can accommodate custom orthotics. Meets ASTM F1677, Mark II standards for slip resistance.