So, I received my MEN'S PEAK COMPRESSION LONG SLEEVE TOP, and I actually wore it to work as a base layer, I work in security, and I wore it under 3 other layers, A jacket, and a zip up fleece and my work shirt, which is short sleeve and it was raining and very cold all day, which I only noticed because the gloves I had on started to retain rain water, with that being said, I was totally warm considering how much wind and rain there was. Initially there was sweat in my underarms, and the sweat did go through to my work shirt, which is normal unless I take off layers, and air dry which I didn't. It rained most of the day and I had all these layers on, and more often than not when I get home, my shirts are soaked through and through depending on the night, this compression shirt, was dry, and my work shirt was dry. That to me is a win, and I will be wearing it to the gym to really put it through its paces. So far, I am impressed with it and the size is perfect.