The Montbell UL Down Inner Pants are one of the lightest insulating pants in the world. At only 6.8 ounces they are incredibly warm for their weight.
These pants stuff down very small and come with an ultralight stuff sack. Elastic hem with drawcord keep the waist in place. Zippered fly with snap is convenient in the field and makes on/off easier.
High quality 800 fill power hypoallergenic goose down provides warmth without weight. The shell is made out of 15-denier Ballist Airlight ripstop nylon that is incredibly soft, light and highly wind resistant. Single-quilt construction reduces weight. DWR finish resists rain and snow.
Can be used with a down jacket and bivy bag for an ultralight sleeping system. These pants are so light you will not have an excuse to leave warm insulation behind. Ideal for backpacking, mountaineering, snowshoeing, etc.