Packable Primaloft® One and a slick nylon face make this puffy ideal for town rambles or touring missions. Compressible 100-gram loft allows it to cram in a ski pack until a rest break or be worn as a warm midlayer on a mechanized approach. Waterproof knit underarm fabric acts as an active stretch panel and a passive pit vent, while synthetic fill traps heat even in drippy snowcaves, at condensed smoke shacks or around drizzly bonfires.