I have worn these for one season and they are simply amazing. Keep in mind that I live in the mountains of southeast Tennessee, so my weather is mild compared to many. However, I only wore these on mornings when it was below 27 degrees with a 10mph wind at 70% humidity. Sitting in these conditions for 6+ hours is a challenge no matter what you are comparing it to. These are the best cold weather base layer I have ever owned. I've worn expedition weight military polly and big box store expedition weight thermals, and these outperformed all others. It honestly wasn't even a competition.