Designed as a protective base layer, the Columbia PHG Midweight Base Layer Shirt is a versatile and high-performance shot that every serious hunter should own. This polyester blend shirt features Omni-Heat reflective technology, which warms you by reflecting your body heat. Omni-Wick technology aggressively works to wick excess moisture away, keeping internal moisture to a minimum and you warmer in the stand. An antimicrobial treatment inhibits the growth of odor-causing bacteria, keeping you fresh and keeping your scent from spooking wildlife. This shirt is limited to an insulation layer. It works great as a standalone shirt during mild or chilly hunts that don't necessarily require a jacket.