Just thought I would let you all know about this waistcoat with high collar. My first go with heated gear and even though it was 10 degrees in the Yorkshire Dales there was always a cold wind. I was wearing a decent Merino wool base layer and the waistcoat over that plus a well known 3 layer jacket. I think its 35watts and when I put it to max I cant believe how warm they are. Easy to use and ended up turning it to low. This isnt the best review but if you are thinking of buying one they are superb, if I would have known how good they are I would have bought one years ago hence my post.