The Columbia Freeze Degree Tank comes correct with the Omni-Freeze ZERO cooling system. The fabric is cool to the touch, keeping your core from getting as hot as the hell you may be running in. One tester took this tank out in the heat of the day on grueling hill climbs, working up a sweat. She noticed a significant difference in her body temperature fluctuation when wearing the Freeze Degree as compared to other wicking shirts. We’re not sure what scientists to thank for this, but we dig the small, blue cooling rings on the inside of the shirt that react to sweat. Omni-Wick Evap fabric is located on the sides and back, dispersing sweat to keep the skin as dry as possible. The Freeze Degree tank incorporates Columbia’s Omni-Shade technology as well, adding UPF 50 protection to shield you from those ultra violet rays. Impressed yet? You should be.