High quality - headguard are made of 100 percent 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 high-performance EVA foam give the head a stable support and all-round 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 3-5,YM= 21 - 23 inches (48-53cm),suitable for aged 6-11. 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store