I bought these for my son for cmas along with the matching Duofold by Champion Thermals Men's Mid-weight Long Sleeve Base-layer Shirt, my son is a full time college student and must walk from building to building, and we are in Upstate NY. He puts these under his clothes and says they keep him very warm and he does not feel like a stuffed turkey. The undergarments fit nicely under his clothes and keep him warm. These are also very well made.