Engineered with Gore-Tex, offering enduring weather protection, comfort, balanced heat transfer, and optimum moisture management 800-fill goose down on back of hand retains critical loft for consistent, dependable warmth Primaloft Gold insulation with Cross Core is fused with aerogel technology for the highest level of warmth in any conditions Pittards goat leather adds durability and abrasion resistance Pertex 20D ripstop is lightweight and Diamond Fuse fabric technology provides extra durability and stability over extended use