For heavy duty use, the Carhartt 10-inch Black Mine Boot is a no-brainer. 10" Mine Boot, Black oil tanned leather with Black abrasion resistant leather. PU midsole with Carhartt rubber outsole. OrthoLite insoles, molded TPU heel counter, WP membrane, 400 LiteFire insulation. ST, PR Plate and Internal Flex Metatarsal. Oil, chemical and slip resistant.