Using wicking and quick drying Drirelease merino, the Outdoor Research Women's Essence LS Zip Top is designed to work as a baselayer, a midlayer, or a stand alone top. This product will be shipped directly from Outdoor Research and will leave their warehouse in 2 3 business days. Eligible for UPS ground shipping only. . Drirelease merino fabric is wicking, quick drying, and breathable. Drirelease merino dries four times faster than 100% wool. Drirelease merino has a higher thermal insulation value than 100% wool. FreshGuard Odor Neutralization keeps the garment smelling clean. Flatlock seam construction. 14 length front zipper. Snug, close to skin fit.