Speed your warm up time and keep your arm loose between innings with the WikMax HEATR® Warming Sleeve. Worn by the pros, it's designed to help get muscles warm fast and keep them warm. The patented WikMax technology absorbs,stores and releases heat helping to get the muscles loose and warmed up faster. Tiny micro-chambers in the fabric expand and actually heat up upon contact with the skin, which means faster warm up time and better performance on the field. The WikMax HEATR®Warming sleeve features 10 percent HEATR® fibers and 90 percent Micropoly fibers, soft and comfortable like cotton, the antibacterial fabric helps destroy bacteria and cuts down odor.