I use it for skiing and I wear it also on the motorbike. It fits well under the jacket. It is not very obvious you are wearing it, it hides well. It does not restrict movement. It already helped me on the skis. I did not felt from the bike wearing it yet. It files relatively heavy, when you first put it on, but you will soon forget you are wearing it at all. It is not so cold as I hoped it will be, but I do not sweat under it.