I bought a pair of Kuiu Expedition gloves for my hunt in MT, and had high hopes they would keep my hands warm, they were a waste of $$ and I'm sorry I bought them, granted temps were down to -10 but ended up using my Cabela's wool thinsulate that were less than half the cost and worked twice as good!
I don’t find that any gloves keep me warm at that temp. Mitts only for single digits and below.
