This long-sleeve, unisex jersey has a high neck and a 16-inch zipper for easy ventilation. We improved this style with angled side pockets so they are easy to get into on long ride and runs. It is made of Polyolefin, a new generation of polypropylene. It is the ultimate fabric to use as a first-layer for any cold weather activity. It not only keeps you warm, it is odor- resistant and has moisture-transfer properties that move moisture away from the skin to the surface of the fabric where it evaporates. It is designed to perform best when worn tight against the skin.