WARMTH : Enhanced thermal fabric of the women base layer is thicker, keeps you warmer – all without increasing weight.And the zipper at the neck is the deepest of any on the list, offering the most flexibility for venting and cooling. MOISTURE WICKING&ORDOUR CONTROL : This women thermal base layer with micro fleece that wicks moisture away from your body to keep skin dry and helps keep fabric fresh. SEAMLESS : The seamless technology to limit irritation and no worry about that sticky during any outdoor activities. STRETCHY FIT : The women base layer is made from a stretchy fit fabric that stretches in four different directions ensures full range of motion SUIT FOR MANY OCCASION : The base layer top are really warm and perfect for running ,skiing,hiking,jogging,walking on cold weather.