If your looking for a great base layer try 32 degrees heat. When I first tried it for hunting I thought no way it’s going to be warm for how thin it is but this stuff is awesome. Costco sells it and you can find it on Amazon also. Less than $15 for a top or bottom. I put under a very light pair of pants and they keep me nice and warm but not hot. I’ll be wearing today in Wisconsin with the temp around 45.