Keeps your body dry and comfortable during exercise in cool to cold conditions. The core of our elite layering system, proZERO adheres to your body like a second skin. Featuring internal air channel construction which allows warm body heat to escape through a single interlocked knit before turning to sweat. Textured filament yarns stay in touch with the skin to transport any moisture that does occur to the surface area of the fabric where it is quickly vaporized. The closer fit is achieved through a circular knitting process that allows most garments to have seamless torsos and high stretch for a non-restrictive fit. Recommended from 30F to 60 F.