These warm-up booties are perfect for dancers to keep their feet warm, ready, and prepared between classes and rehearsals. They are designed by experts and are suitable for adult dancers. The booties are filled with 100% polyester for warmth and comfort, have a cushioned heel, and a 100% nylon shell. They come in various sizes: XS (US 13.5-1.5), S (US 4-6), M (US 6-8), L (US 8-10), XL (US 10-12). Not recommended for outdoor use.