FEATURES: Arc Reactor Core(TM) disperses forceful impacts and dampens ball rebound Dynamic Fit System(TM) 2.0 offers form-fitting design, flexible shoulder and back harness This catcher's chest protector features our Arc Reactor Core heart guard technology that disperses forceful impacts and dampens ball rebounds Revolutionary design is engineered for maximum performance and a comfortable fit ADDITIONAL DETAILS: Size Adult: 16.5'' (Measured from clavicle to naval) This was designed to reduce commotio cordis injuries and to meet the NOCSAE(R) commotio cordis standard NOCSAE approved