This base layer is so comfortable, as it just hugs the torso just right. I've been wearing it under a hoodie and it keeps me warm in our chilly weather in the mountains. It really maintains heat, but I am also not getting sweaty. I love this and will be buying the same long sleeve version now too. I typically wear a size small, but sized up to a medium and the fit is perfect.
This is the perfect base layer. While wearing it, I don't get too hot, nor do I get as cold. I used to not like base layers because I would overheat in them. This base keeps my temperature regulated. Washes up nice. Stays soft. Perfect.