BIG BREEZE® Intelligent Work Boots: The Heel Expands Pulling Fresh Air In ; The Heel Compresses Pushing Humid Air out Metal Free Protection Composite Protective Toe & Polymer Anti-perforation Insole Full Grain Leather Reinforced along the sides for more stability Reinforced Mesh in Kevlar® Vibram® Fire & Ice™ Sole and Bumper Toe made for extreme cold and hot conditions Easy Clean Thread Shock Absorbing Oil & Petrol Resistant Sole Anti-fatigue Non-Marking + Slip Resistant Rubber Orthopedic Insole with Micro Perforations permitting a good air circulation inside the boots. Flexible Strobel Scentrap® Anti-odor Treatment Lining High gusseted tongue to prevent debris and water from entering the boot Double and Triple Heavy Duty Stitching in Stress Area Imported