4 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing 100% waterproof women's boots feature a high-grade extended rubber exterior for added toughness and extra coverage Anti-microbial XpressCool fabric lining pulls moisture away from skin to keep feet cool and dry in warm weather; comfort rated from 40 °F to 95 °F (4 °C to 35 °C) Women’s last is designed for the female foot; shock-absorbing insole and outsole for extended long-wearing comfort Slim toe and wide heel for riding; easy on-off style with pull-on tab