Full grain leather upper. Mid-height, full grain leather upper with sweater collar. D-Ring front lace fastening system for secure comfort. Premium Rubber base for flexible durability. Removable anti-fatigue insole. Fixed-Fit multi-layer inner boot system featuring Thermaplush™ soft, next-to-foot wicking layer for warmth. Form-fitting -Tek™ Foam lining for comfort. Tek™ Heat lightweight, insulation for high-loft breathability in a broad range of temperatures. Tundra Rated For Frozen and Snow-Covered Terrain.