Our New Youth Pro-X4 Knee Guards boasts a new SmartFlex pre-curved padding for extended coverage and an ergonomic, comfortable ride every time. These CE-1621-1 Level 1 certified guards have innovative heat management and ventilation systems to keep you cool and dry on the trails. Additional padding and as secure fit provide ultimate comfort and easy on-off, and throw it in the washing machine when you're done for the day.