High quality headguard are made of nylon and spandex.Sung Pads this kind of helment is lightweight and covered with thicker pads which can protect your kid's head during doing exercise to avoid injury and exercise for a period of time does not increase the burden on the head.Breathable Adjustable rear laces insure proper fit;The venting holes on the top ensure that you don't feel stuffy and the longer cheek length gives the maximum allowed protection to the upper jaw and cheekbone.Design triangles and polygons pads highperformance EVA foam give the head a stable support and allround protection from impact and abrasion.Size Chart Adjustable chin strap and rear laces insure proper fit. The size:YS= 19 21inches (43 48 cm), suitable for aged 35,YM= 21 23 inches (4853cm),suitable for aged 611. Please refer to the size chart carefully before you place an order. If you are not sure, please to contact us and we will give you a reference.