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 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 transferance 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)