A really warm down jacket in a lightweight design is the definition of Burton's [ak] Baker Down Expedition Down Insulator. The outer material is made of Pertex that makes the jacket durable and water resistant. The insulation consists of 90% down and 10% feathers of a really high quality and an entire 800 FP. An adjustable hood ensures that your head is also kept warm on really cold days! Of course, the jacket is Bluesign certified.
Pertex shell and lining, 90/10 RSD down: 800 Fill Power