I love these base layers! They fit well, I am 5’7”, 145 lbs and typically fit between a small and medium, the size small fits me perfect for a base layer, snug but not tight. I also have a size medium that fits loose enough to be worn as a shirt/sweater. These base layers are soft to the touch. The merino wool feels great on the skin! Incredibly breathable. The base layers are a nice weight. They are warm, and even warmer once you start moving around! I will be purchasing more products from this company!I received a free neck warmer with my products. It is very nice, keeps just the right amount of heat in, and has a very nice texture.I have been in touch with the company, they are quick to respond!