Toe Warmers Women's Abby Boot Nylon Shaft measures approximately 7.5 from arch Boot opening measures approximately 15 around Waterproof 100% polyester Microdry fiber upper blocks moisture from entering inside the boot Radiantex reflective thermal membrane insole reflects heat back to the foot, using your body's natural warmth to maintain comfort Canadian plush Borg pile, an acrylic fleece, lines the boot and keeps the foot warm and comforted Sleek-looking thermoplastic rubber (TPR) outsole remains flexible in cold weather and resists skids