Mountain Hardwear’s Cool.Q™ ZERO technology is sweat activated to produce a cooling effect. The Way2Cool short sleeve T-shirt, was worn by Max King while running the Grand Canyon. According to King, the Way2Cool shirt exceeded his expectations. The shirt actually lowers the overall temperature of the fabric, accelerates the wicking process and helps your body minimize heat and maximize energy. It retails around $65. Visit www.mountainhardwear.com.