Kid Youth ATV Motocross Dirt Bike Helmet 804_291 Matt Black (YXL) YS __ 18 3/4"-19 1/4" YM __ 19 1/2"-20 1/4" YLg __ 20 1/2"-20 7/8" YXLg__ 21" Cushioned chin strap with stainless steel dual D-rings +quick release buckle strap.