The new Underworks Microfiber compression tank brings you the softest feeling compression fabric against your skin,with maximum breathability and multi-directional stretching that conforms to every curve of your body in a perfectly cut tank top. Invisible under your clothes. Micro-Fiber soft touch, is a man made synthetic fiber made by Dupont®. These yarns are especially engineered ultra fine filament yarns in which each filament has a controlled thickness that is 15 times finer than human hair. The result is Unmatched comfort, fit, and durability. Our microfiber tank also has an SPF 50 rating for your protection. Made in USA.