The Kamik Kids' Star 3 Winter Boots are for sled speedster's winter fun with their seam-sealed waterproof construction. Its a removable 6mm felt/2mm EVA insole with silver foil lamination for added cold protection. They are designed with foam and fleece insulation and lined with a moisture-wicking faux fur to keep them comfortable down to -40F. The Kamik Kids' Star 3 Winter Boots are lightweight and insulated with technology features to withstand any snow fun this winter.