The Camp Armour Junior Helmet is a hybrid design, combining the traditional hardshell with expanded plastic foam for a great balance of weight and protection. Includes the same features and styling as the adult version, so it\'s ideal for kids who want a \'proper\' helmet. The wheel based sizing system at the back makes it very easy to get the best fit. Kid\'s specificHybrid construction Rotating size adjustment wheel Comfort chin strap Headlamp compatible UIAA 106 / EN 12492 certified Size: 53 - 61 cm (21\" - 24\") Weight: 310g (10.9oz)