Think of them as mobile sleeping bags, perfect for mornings when you want to climb, but don't want to leave behind all your body heat. Highly compressible, wind-resistant Puffballs have slick 1.3-oz., 30-denier ripstop nylon shells with a DWR (durable water repellent) finish, and linings that move freely over layers and under shel ls. Unlike down parkas, synthetic ( Micro- Ioft) Puffballs will keep you warm even after getting soaked. Both versions stuff into their own pocket. Made in USA.