ACTIVE COOLING TECHNOLOGY by McDavid is our latest development in the area of dynamic thermos management. ACT features an enhanced evaporative cooling effect that may keep your skin up to 5 degrees Fahrenheit Cooler (2 Degrees C.) ACT actively retains warmth within the muscles while cooling the skin's surface. Blood flow and in turn, performance is further enhanced with built-in compression capabilities. Find ACT fabrication in all our new uCool products.