The chest protector shirts are made from the premium materials with 82% Nylon, 18% spandex. Moisture management function keeps athletes cool and dry. Constructed with moisture wicking four-way stretch fabric that moves with your body while eliminating sweat. Mesh fabric across shoulders back and sides for superior breathability. Wash with cold water and tumble dry low. 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.