The Mountain Hardwear Kor Strata Hooded Jacket is a super compressible, breathable, and stretchable synthetic puffy mid layer that packs into itself and features a highly mobile articulated fit. That means you can take this with you on any adventure and trust that it will move with you and keep you warm without excess bulk. The Mountain Hardwear Kor Strata Hooded Jacket is great for cold starts, cool days, and easy storage in your bag once you start to heat up.