Cold weather fishing enthusiasts will tell you: in winter, using thermal underlay is an all too often overlooked method of staying warm. This Kore long sleeve thermal shirt will keep you warm while providing great comfort. Its quick-drying brushed interior helps regulate body temperature so you don't get cold. In addition to its thermal properties, it is also breathable and wicks moisture away from the skin. Although it's tailored to fit your body, it's so light you'll almost forget you're wearing it. It's long enough to stay in your pants, and the sleeves have grommets to keep them from riding up when you put on a new layer. The perfect piece to wear under any of our hoodies, sweaters or fleeces. This olive green t-shirt is available in sizes S to 3XL.