How the outdoors became great again. Ozark Trail’s Upstream Shirt for Men is designed to keep you comfortable, dry and cool during all the activities. This men’s button-up shirt features a mesh-lined back yoke to enhance airflow and help keep you cool in warmer weather. This men’s shirt also has two chest pockets to securely hold your smaller items like a phone or compass. Roll-up tabs on the sleeves provide added versatility and styling—think casual dinners with friends or a weekend away in the woods.