Arctix Men's Thermal Base Layer Pants - Cold Weather Thermal Underwear for Skiing, Hiking & Outdoor Activities

I have numerous base layers ranging from merino wool, polyester, synthetic etc. These are on par with the merino wool, maybe even warmer. The gridded fleece lining makes them superb. They are very comfortable and have a lot of stretch. I am a size 6/8 female and the men's small is a perfect fit. I recently bought the boys x large, and they fit just as well, and are at least $10 cheaper. If you are a small, I would suggest getting the boys to save some $.