These 10 Inch Waterproof Insulated Loggers feature 400g Thinsulate plus an Ortholite Triple Density insert to keep your hardworking feet comfortable. The oil- and slip-resisting Vibram Thunderstruck TC4 Plus outsole has a rugged, multi-directional tread pattern designed to flex and grip on multiple surfaces. This boot meets ASTM F2892 safety footwear standards.