Designed by some of the world’s foremost adventurers for dialed backcountry layering, the Microtherm’s 800-fill goose down makes this mid-layer nice and warm but allows it to pack down small and fit easily in your pack. It will repel some precipitation, which is ideal for skinning during light snow flurries, and the jacket’s athletic cut fits well under an outer shell.  [$169: eddiebauer.com]