User Review: MontBell Men's U.L. Down Inner Jacket
Fabric: ballistic nylon from Montbell
Price Paid: $169
I found the jacket is fine at low altitudes in the summertime but not very good for colder temps even with a shell. The key word is Ultralight - this jacket liner works in conditions that favor an ultralight hiking kit. In more serious conditions, the insulation falls short. Also had a problem with feather leakage.
I now use a Feathered Friends Helios for more serious trips.