I don't have the sweater but I do have the Patagonia jacket with hood and seems to keep me pretty warm in camp. But, like you, I get cold and am thinking of layering a Montbell or WM down vest under it while in camp or sleeping, if I am in colder temps than I want to be. The coldest temp I used the Micro puff was in the low teens, snow, in West-by-god-Virginia. I was just using my Hubba Hubba fly as shelter. Yes, it was cold!!! I was ok....but wished I had a closed-cell foam pad under my Big Agnes...and a down vest. My bag was a TNF down rated 20 degrees.