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.