The Breezy Mid was built on a last designed especially for women, providing ultimate fit and comfort. It's a casual all-purpose boot that is 100% waterproof and features a lightweight and flexible 4mm CR flex-foam bootie with four-way stretch nylon. The Breezy Mid 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, and a lightweight EVA outsole with rubber pods that provide optimal traction and support. Temperature comfort range: Sub-freezing to 95°F.