The warmest women\'s Muck Boot has been upgraded for greater warmth and comfort. Designed for durability, the new boot works well in the stable or mountains, on city streets, or even at a cold winter football game. Made with new 5mm CR Flex Foam lining layered insulation and backed with a fleece liner, the boots displace moisture effectively while keeping out cold. The EVA midsole reduces weight, while the new aggressive outsole is highly resistant to slipping. 5mm Muck-Prene Insulation. Warm Fleece-lined. Extended Rubber Exterior. Comfort Insole with Dual Density EVA Footbed. Slip-resistant Rugged Outsole. Women\'s Last for slimmer fit. 100% Waterproof. Comfort Range - 40C to 4C.