Under armour coolswitch uses an exclusive coating on the inside that pulls heat away from your skin making you actually feel cool and able to perform longer the airvent inserts on the inner arm deliver breathability the locked in ua cpmression fir increases muscle power and comfort allowing you to keep going all day moisture transport system wicks sweat away from the body and dries super fast no restrictions thanks to the 4 way stretch fabrication allowing a greater range of movement in an