It feels a lot better than cotton ones I used before (worthless in snow as I found). I used this with jeans and other pants up to 0F (-17c) and it worked for me, but I would say that if you are a more...uh...cold person, you may want to upgrade to a warmer set of Chillys. For me it was enough and it feels great. I bought one size larger as I don't really enjoy the ballerina look of tight pants, they also work as ninja pants for whoever needs one.