I spent 4 days this week in Yellowstone Park observing the wildlife...particularly the wolves. It wasn't terribly cold, only down to about zero F., so didn't get to make a real test, but I could tell that the jacket was good for at least 20 to 25 degrees less. It is very comfortable as well as good looking. One thing I'm always concerned about is zippers. The Nuptse has a large easy to use one that is not likely to catch material as it's used. I'd give the jacket at least an "A", and would judge BackcountryStore.com's service the same. The Denali gloves are also very nice. They served very well at the temps we encountered and probably would be good down to maybe 15 below or so.