The Berghaus Womens Tech Vest T-Shirt is a great high performance base layer that has everything you need to conquer your bucket list for the outdoors Loaded with expert detail the Super Tech Tee Vest is made to be challenged It works in harmony with your body to help keep your climate under control as ARGENTIUM reg PRO technology reacts to the physiology of your body It becomes extra cooling and breathable when you heat up and works to be more protective when you start to cool down