Youth specific fit Articulated construction for a more secure and comfortable fit Arch support 63% acrylic, 22% polyamide nylon, 12% polyester, 3% elastane Designed specifically for kids to stay secure and comfortable, these socks feature an articulated construction and arch support. Built from 63% acrylic, 22% polyamide nylon, 12% polyester, and 3% elastane, they'll help keep feet supported.