The TXlite Midlayer zip with its stretchy and flexible PowerComfort™ fabric sits comfortably under a jacket all day out in nature or be worn by itself if the weather allows it. The zipper makes it easy to regulate the temperature by opening and closing it, completely or partially. The collar helps keep your neck extra warm when the wind blows. Even the pockets are equipped with zippers so that you can easily store your belongings without the risk of them falling out.