Omni-Freeze ZERO sweat-activated super cooling Omni-Wick pulls moisture away from the body so sweat can evaporate quickly. Omni-Wick pulls moisture away from the body so sweat can evaporate quickly. side panels. Hike through the heat in this crew neck graphic t-shirt with sweat-activated cooling system to keep you feeling cool when temperatures rise. The sweat-wicking fabric and side panels draw moisture away from the skin to keep you fresh, even on tough days.