Protect your core with the Chest Shirt, engineered with proprietary PolyShield(TM) technology to help reduce impact to the sternum and chest. Lightweight, breathable materials provide a comfortable fit under your uniform while allowing unrestricted movement, giving athletes the confidence to compete when every play matters. Product Features PolyShield(TM) technology helps reduce the risk of chest, sternum, and heart injuries from high-speed impacts. Lightweight, breathable construction flexes with your body for enhanced comfort and performance. Designed to fit comfortably underneath any jersey or uniform. Machine-washable, weather-resistant materials provide long-lasting durability. Made from 90% polyester, 10% spandex with proprietary PolyShields(TM) technology. Machine wash cold and air dry only. Do not bleach or machine dry.