We searched long and hard for the perfect material to create these ultra comfortable made in the south performance shirts. We went with a lightweight heathered poly/spandex blend, which makes these shirts extremely lightweight and stretchy. This fabric is also rated at UPF 30 sun protection while still being cool and breathable. Along with a Dry-Tec treatment that wicks moisture away from your body keeping you dry and comfortable all day long. These shirts are the ultimate performance shirt for all activities.