Upper Full grain leather upper Full leather external wrap, secured by 3 Velcro straps to protect the foot from sparks and metal burns entering the boot Metatarsal cover engineered to protect the metatarsal bones from falling objects Lining The quarter lining is from an Industrial Ferrabelle non-woven material The vamp lining is from a special Kevlar blend material and laminated to foil to reflect heat away from the boot In Sock Non-woven material in-sock laminated to Kevlar, to protect the foot from heat transference through the sole of the boot Top Sock Anti-bacterial Energiser top sock with anti-microbial properties Midsole Shank reinforcement for additional arch support Toe Cap Aluminum Sole Dual Density PU/Rubber Sole (Heat-resistant up to 300°C)