The boot is made from natural rubber to ensure it is totally waterproof. Not a single pair slips through the cracks: every pair of boots produced is tested for watertightness! The boot is filled with air and then immersed in water. If no bubbles appear, it fulfills its purpose and is ready for you to wear. These lined boots are designed for you to wear on the coldest of days with a faux fur lining that retains warmth and dries quickly. The sole's composition is designed to provide optimum grip and be longlasting: ideal for slippery surfaces and soft ground.