Foster Firefighters Boots Upper: 2.2 – 2.7 mm Fire Resistant Leather / 100% Waterproof / Breathable / Cut and Puncture Resistance / Screws Leather Lining: Sympatex® (Optional) / Waterproof, Breathable Barrier Insole: Puncture Resistant Stainless Steel Plate Outsole: Lightweight Vibram Rubber / Oil and Acid Resistant / Shock Absorbent Non-Slip Heel / 300°C Temperature and Fire Resistant Number: 36-47