Ideal as a second layer: The Cosmos down jacket by La Sportiva. The outer material is completely windproof and will keep you warm. The lining is made of high quality goose down, which insulates well and is easy to compress. Because of the special chamber construction the down does not slip and fulfils its function also after having been packed and unpacked for a number of times.
The hood of the Cosmos down jacket is lined, as well, und will ensure that your ears are warm. It comes with two side pockets, in which you can keep your hands warm, as well as another inside pocket for your smartphone, snacks or other items. A stuff sack is included, in which you can easily transport the jacket and it needs only very little space in your backpack. The Cosmos down jacket is bluesign-certified, which means it was sustainably produced.