Upper: FLAME/HEAT-RESISTING Rubber Construction: Vulcanized Rubber/Shoe FIt Engineered Outsole: FLAME/HEAT RESISTING White "Traction Lug" Lining: 3.5mm Polyester Needled Felt with Heel Reinforcement Insole: Removable Superknit Covered Polyurethane Midsole: Stainless Steel Puncture Resisting Bottom Plate Shank: Steel Triple Ladder Shank Special Features: Meets Both NFPA Requirements. UL Certified. Blood Borne Pathogen Compliant. ASTM F 2413-05 M/I/75/C/75 Oversized Steel Toe. Electrical Hazard. Double Reinforced Pull Loops. Cushioned Shin Guard. Light-Reflecting Instep and Heel Patches.