The new Underworks® microfiber compression crew neck long sleeve t-shirt offers multi-directional stretching that conforms to every curve of your body and moves with you. Made from Micro-Fiber soft touch, a man made synthetic fiber engineered by Dupont® where each filament has a controlled thickness that is 15 times finer than human hair. The result is the softest feeling compression shirt against your skin, with maximum breathability, SPF 50 UV protection in a perfectly cut compression undershirt. Invisible under clothing. Made in the USA.