ALPINESTARS SX-1 YOUTH KNEE PROTECTOR BLACK/RED SM/MD - 482-6152SUpper and lower frames are constructed from a high performance polymeric material blend for optimized levels of flexibility and strength as well as excellent weight saving properties. Polymer protector plates are strategically perforated for maximum breathability and air ventilation. CE certified knee brace to the latest EN 1621_1: 2012 K type A (Level1) Upper frame features extended frame for increased thigh protection without compromising mobility.