The SockGuy EliteTech Base Layer Top offers a super soft, next-to-skin fit with ultra-wicking performance. We have developed our fabrics specifically as a lightweight moisture transfer syste to keep the next-to-skin surface driest and dramatically increase evaporation rates. Combined with our Cool Comfort Construction techniques, the fit of EliteTech Base Layers optimizes moisture transfer without constricting movement or adding bulk. ProLite is our lightest sleeveless base layer with super stretch open-mesh to provide superior ventilation and moisture transfer for high temps and indoor training. Made of 85% Polyester and 15% Spandex.