This is my new favorite first layer shirt. It is warm immediately when I put it on. It is just a little bit slick so my top clothes don't cling to it which is nice for a first layer. It is fitted but certainly not tight. It is long... so if you tend to have trouble with sleeve or body length, this is a real winner for you. It's good for the activities that are active, but my office is cold, so I wear it to work everyday. I have 2 now. I highly recommend this is shirt!