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. BUY FROM A TRUSTED USA COMPANY — At Pure Athlete, we are experts in ski socks. We are manufacturers of many of the bestselling men??s ski sock and women??s ski sock styles. Don??t take our word for it, read our customer reviews and try our ski socks. We know you will love them. 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.