Rangeball, sorry I took so long. I sat last year all day in it, and when I left the house it was in the single digits. I only had the pullover coat last year, but just got the pants as well. I usually wear a pair of wool underwear, and a pair of polypro undearwear. If its extremely cold, I may use a pair of fleece sweats too. I really like the stuff and I can almost guarentee you will also. Give it a try, it has a money back guarentee on it. Can't beat that.

Again, sorry for the late reply buddy