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Featuring an incredible warmth-to-weight ratio, the ultra-lightweight Filament Jacket is a never-leave-it behind down insulated layer. Useful as a fall belay jacket on its own or as insulation under a ski jacket, the Filament cuts the chill when worn alone in cool weather and holds in the heat as a mid-layer in truly nasty conditions. The super-packable, DWR-treated 10D Pertex Quantum fabric sheds moisture, further increasing the versatility of this featherweight, compressible, year-round down jacket. This down jacket is sure to become a favorite in your closet.