Size/Fit Summary: Fits smaller. If you have a wider ankle or are in-between sizes, it is recommended to size up due to the fitted sock inner which fits snug to the ankle for ultimate insulation. Ready for icy city streets and snow-topped mountains, our Women’s Insulated Metallic Ankle Snow Boots are designed to be worn in temperatures as low as -22°C (-7°F). Made with a hydroguard coating, these lightweight, slip-on boots have a waterproof foot for protection from puddles and snow. To keep your feet warm, they are lined with vegan fleece.