Arctic Cool is powered by what they call HydroFreeze X technology. Their cooling management system not only lowers your body temperature as you start to heat up (as if that wasn’t enough!), draws the moisture away from your body so you stay dry AND(!!) uses your very own sweat to activate their cooling system in the fabric to keep you cool! Their goal is to allow us to work longer and harder at our very best, no matter what you may do to pursue a good sweat.