The MontBell Men's Ultralight Down Inner Jacket is warmer than a heavyweight fleece and lighter than most base layers—it's ideal for alpine climbing and other adventures in which weight is vital. MontBell stuffed the water-repellent Ballistic Airlight nylon shell with 800-fill down so you stay warm on that frozen waterfall. Compressing smaller than the size of a water bottle and weighing only 6.9 ounces, the Ultralight Down Inner jacket provides excellent insulation in cold weather and is hardly noticeable in your pack.
Bottom Line: Leave your bulky fleece at home and bring the MontBell Ultralight Down Inner jacket.
FeaturesMaterial: 15d Ballistic Airlight nylon with DWR coating
Down Fill: 800
Pockets: 2 Hand
Recommended Use: Winter camping, alpine climbing, backcountry skiing
Weight: [Medium] 6.9oz
Core Venting: No
My ExperienceI have the previous version which was called a sweater, it had snaps and no pockets. This new version has a zipper and 2 pockets, and is supposed to be a few tenths of an ounce lighter and is the same price ($140).
It is a great lightweight jacket, this and a ultralight shell were all I wore over my base layer in camp, including thru the High Sierra in June.