This specialized boot is sewn with Nomex fire-resistant thread, and features a four row secure stitched quarter and counter, eyelets and hooks set on stainless steel washers, a Cambrelle II lining treated with Agion antimicrobial, leather storm welt sewn with Kevlar thread, Goodyear welt construction, a rubber midsole, and an oil, slip and heat-resistant Combine II rubber outsole. The removable orthotic airflow polyurethane insert and cover is breathable from head-to-toe, anti-fungal, anti-bacterial and washable. Flexible internal Metatarsal guard meets ASTM MT75 standards. Steel toe meets ASTM F2413-11 standards. Electrical hazard rating meets ASTM F2413-11 standards.