This XRD Series chest protector is now powered by the new PORON XRD, which on impact causes the high performance molecules to create a unique protective shield that can absorb up to 90% of the most intense force, hit after hit. Also, this chest protector is enhanced with the latest in Power Balance technology which will help you improve your balance, strength, and flexibility. The Dynamic Fit System over the shoulders and the dual back strap adjustments create custom fit. Size: 17".