Help protect against the impact minor injuries to the sternum and chest area by sporting the McDavid(R) Adult Hex Sternum Shirt, designed with Hex(TM) padding to keep athletes safer. Performance Benefits: 9mm Hex(TM) Technology is positioned perfectly to protect the sternum and chest area hDc(TM) Moisture Management Technology wicks away perspiration for added comfort Mesh fabric offers a ventilated, breathable feel to keep athletes cool and dry Additional Details: Sleeveless construction Machine washable WARNING: This product is designed to minimize injury from minor impacts to the sternum and chest area. It is not guaranteed to reduce the risk of Commotio Cordis , a rare but sometimes fatal injury arising from sudden impact to the heart.