Kamik Men's Zylex Boot Liner;

The Kamik® Liner 12 adds an extra layer of warmth to your boots with its lightweight yet durably insulated construction. Liner constructed of three layers: •Layer 1: 2 mm Polypropylene wicks moisture away from the foot•Layer 2: 5 mm Black polyester felt traps body heat keeping foot warm•Layer 3: 1 mm Thermal foil deflects cold air & allows moisture to escape Reinforced seams and heel guard offer excellent durability. Easily removable for quick overnight drying. Made of 97% recycled material and 3% other materials. Comfort rated to -40°F/-40°C (Yup, the rating conversion is correct). Imported. Measurements: Weight: 7 oz Circumference: 17 in Shaft: 12 in Product measurements were taken using size 12, width D - Medium. Please note that measurements may vary by size.