Designed in collaboration with professional Search & Rescue teams, this extremely protective jacket for women is made for those who spend long hours on cold mountainsides. It’s extremely protective with a superior warmth-to-weight ratio for easy packability. We used groundbreaking insulation technology -- Lifaloft™ sheet insulation in combination with PrimaLoft® Gold fiber balls and a conductive graphene lining -- to achieve superior warmth. The warmth is distributed strategically via optimized body mapping. As always, we added the weatherproofing you need to stay dry as well as warm. The jacket uses our innovative Lifa Infinity™ hydrophobic fabric, for waterproof/breathable technology. Its weatherproofing properties last without retreatment. This is a certified bluesign® product.