The Hot Chillys Micro-Elite XT Zip-T combines mountain-weight warmth with outstanding versatility. Its wind-resistant stretch fabric features a smooth exterior for easy layering and a brushed fleece interior for next-to-skin comfort. Moisture-wicking performance, thumbhole cuffs, a quarter-zip collar with interior wind flap, and UPF 40 protection make this active-fit top equally at home as a base layer or lightweight midlayer in cold winter conditions