- Made with MicroSupreme acrylic fiber, this base layer is silky soft. Slightly thicker than the Un-D-Lite but still very thin, Un-D-Shurt works well for layering even in warm climates. In cooler temperatures, just layer on another Un-D-Shurt or an Un-D-Flector. Available in tank, short sleeve and long sleeve. Works wonders for cycling, running, and winter sports.
