These 10" Waterproof Insulated Nano Composite Toe Loggers feature 400g Thinsulate? and 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 F2413 safety footwear standards.Upper - Premium Waterproof Full Grain LeatherLining - Dri-Lex? plus 400g 3M Thinsulate?Insole - Ortholite? Removable InsertConstruction - Goodyear? Leather WeltShank - MetallicOutsole - Vibram? Thunderstruck TC4 Plus combines TC4 plus rubber with a co-molded urethane midsole. It is designed to flex and grip on multiple surfaces. This construction provides lightweight, instant gratification right out of the box.Safety Features - Nano Composite, EH, Meets ASTM F2413 Safety Footwear Standards