Built to breathe. Ready to layer. Max warmth with more airflow. The Vista ¼ Zip base layer features our warmest, fast evaporating, four-way stretch fabric in a lightweight, versatile package. Made from a brushed micro fleece, Vista layers feel soft on the inside with a smooth exterior for unrestricted mobility. ¼ zip closure allows you to vent excess heat quickly. Wear it under your outer layers for warmth in the coldest climates or solo when you need to increase airflow in cooler temps.