Youth SX-1 Knee Protectors - Black/Red - L/XL Youth SX-1 Knee Protectors Extremely lightweight knee protection with large protective area for riders looking for most breathable and lightweight solutions on all riding styles Upper 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 The shell integrated dual pivot hinge gear system follows the natural movement of the knee and keeps the protector well positioned in all riding positions Thermoformed foam backing for excellent comfort against the skin Frames are asymmetrical and feature a slim, ergonomic design for comfort and performance fit Hook and loop / Thermoplastic Rubber (TPR) dual strap closure systems for easy in and out and a personalized, safe fit Straps feature airprene for optimized comfort and airflow