The Marmot Women's Excel 1/2 Zip Top is a long sleeve top for layering up in cool weather. On a run or a hike, the polyester/elastane jersey blend provides lightweight warmth and breathability. It'll take the chill off, while providing UPF 50 protection from the sun that still seems to shine through the cold. Don't be afraid to turn up the speed, mesh panels keep your hot spots cool and the fabric dries quickly. Features of the Marmot Women's Excel 1/2 Zip Top Ultraviolet protection factor 50 Flat-locked seams for added comfort Stretch for increased mobility Mesh panels for breathability Raglan sleeve for increased range of motion Zipper secure pocket Thumbholes Reflectivity