NIKE Kids' Shin Sock Sleeve 48% Nylon/37% Polyethylene/13% EVA/2% Rubber Imported All-in-one design has shin guards built into the sock and reinforced toe for durability Built-in, hard shell provides impact protection while padded ankle provides extra cushioning Ventilated EVA foam padding offers comfortable shock dispersion Sizing (please use your child's height as reference)--Small/Medium: &lt; 3'3", Medium/Large: 3'3"-3'8", Large/X-Large: 3'8"-4'3" The plastic shin guard is removable.