With SmartFlex padding positioned atop the sternum, our Youth Pro Sternum Shirt provides the added protection you need whether you're facing a lively fastball or taking a short hop off the chest. The sleeveless compression shirt and fully flexible, low-profile SmartFlex padding provide superior protection while allowing full range of motion so it won't interfere with your play. Featuring SmartFlex: Flexible During Play. Hardens on Impact. Benefits: •Body-mapped SmartFlex pads protect from impact at the sternum •Moisture-wicking, UPF 50+ compressi •Low-profile, second skin fit.