Eastbay EVAPOR Performance Training T-Shirt - Boys' Grade School Take your training to the top with the Eastbay EVAPOR Fitted Long-Sleeve. Made with EVAPORô technology, this long-sleeve training top pulls sweat off the skin, keeping you cool and dry as your workout heats up. Flatlock seams reduce chafing so you stay focused on your fitness. Fitted design offers support, while allowing natural movement. 84% polyester/16% spandex.. Imported.