G-Form - X4 Youth Knee GuardsThe New 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.