The Reign Tall Boot was built on a last designed especially for women, providing ultimate fit and comfort. It is 100% waterproof and features a lightweight and flexible 4mm CR flex-foam bootie with four-way stretch nylon. The Reign Tall Boot also features Xpress CoolLining, an antimicrobial material that helps to keep your feet cool in warmer weather. It also has a built-in etc sockliner that reduces friction and heat build-up, a durable and lightweight rubber outsole, and a wide-cut heel base for stability. Temperature comfort range: Sub-freezing to 95F.