The Kamik© Youth Stripe Thermal Wool Sock will keep your little ones warm. Crew socks Machine wash cold Size Chart: Small (Shoe size 4-9.5) Medium (Shoe size 10-3.5) Large (Shoe size 4-10) Product Features: Fabric:54% Polyester, 19% Wool, 13% Olefin, 10% Acrylic, 1% Rubber, 2% Other Fibers Kodiak Youth Stripe Thermal Wool Sock