For a lightweight layer that won't slow you down, go with this women's quarter-zip athletic shirt from Impact by Jillian Michaels. Weightless and breathable, this mesh shirt gives you flexibility and comfort. The long sleeves equipped with thumbholes, raglan seams and a contour seam in the back provide maximum mobility. Reflective details in the back make you visible in low light. Mock neck Quarter-zip closure Long sleeves Thumbholes Mesh construction Fabric: 88% polyester, 12% spandex ...