Eastbay EVAPOR Performance T-Shirt - Boys' Grade School Get more from your t-shirt with the Eastbay Performance T-Shirt With EVAPOR. This cotton/poly blended t-shirt wicks unwanted moisture away from your body with the power of Eastbay's EVAPOR™ construction, leaving you cooler, drier, and more comfortable. The fitted design hugs your body better than the standard cut while the tagless neck feels great on your skin and removes potential for irritation. The Eastbay logo and EVAPOR logo give you the mark of The Athletic SportSource®. 60% cotton/40% polyester. Imported.