For cold days on the mountain, we zip up the Marmot Slingshot Down Jacket and head to the lift. The post-consumer recycled NanoPro fabric construction provides breathability and waterproof protection, while the 700-fill down insulation provides exceptional warmth and comfort. For added protection, hook-and-loop cuffs and an adjustable drawcord hem help keep cold air out, but If things get too hot on a sunny day, unzipping the underarm vents solves all of our problems.