6% spandex MEDIUM WEIGHT, DESIGNED FOR WARMTH: The ski sock is designed with special yarns to provide superior warmth and help keep body heat in the sock. The ski socks are a medium thickness to ensure a perfect fit with children??s ski boot. MERINO WOOL = ANTI-ODOR, MOISTURE WICKING: Merino wool helps not to only to keep boys and girls feet at the perfect temperature, but they also give anti-odor odor proprieties to prevent the buildup of stink. The ski socks are also moisture wicking, keeping feet light and dry on the ski slopes. SKI IN STYLE: The bold deer design provides a preppy look and matches with holiday sweaters. Very cute ski socks for kids. OVER THE CALF: The ski sock fits over the calf to help protect your legs from discomfort in your ski boot ?C knee high. The no-slip cuff at the top of the socks ensures they stay in place without digging in. 100% SATISFACTION GUARANTEE: We know these are the best ski socks your kid will ever wear. We guarantee it! If not fully satisfied for any reason, we will refund your purchase in full ?C no questions asked.