Lightweight, ventilated, adjustable gear with an impact absorbing polymeric core. Increased protection at critical impact zones where many blows to the head occur. Used in contact and non-contact league and school sports: soccer, basketball, cheerleading, flag football, figure skating and more; anytime there is a risk of a blow to the head. Can be used inside protective helmets used in sports such as batter's helmets, bicycle and hockey helmets. For soccer athletes, allows the ball to play true as if it were coming directly from the head. xSmall-ages 1-6, Small-14"-ages 4 to 10, Medium-16"-ages 10 to 14, Large-18"-ages 14 and up.