The Columbia Women's Midweight Base Layer Top is a top-rated option for women's outdoor base layer tops. It is made with a blend of polyester and elastane, providing a comfortable and stretchy fit. The fabric is designed to wick away moisture and keep you dry during intense activities. The top also features Omni-Heat thermal reflective technology, which reflects your body heat back to you for added warmth. With its ergonomic seam placement and flatlock construction, this base layer top offers a comfortable and chafe-free experience. Whether you're skiing, snowboarding, or hiking, this top will keep you warm and comfortable.