My Nitro arrived today, 7 days from order. My goodness, this thing is warm! Tried it first against my bare, naked flesh while indoors and soon got a glow on. Now wearing it over a merino T and I'm building up a nice sauna sweat now. Will try outside this evening when things have cooled down. I'm going to have to save it just for winter hikes. It doesn't seem tough enough for regular wear. It's thin (see-through in fact) and I tried (not too hard) to push my finger through and I could hear the material creaking. That area remained raised until massaged flat again. I probably could have pushed a little harder and got my finger to go through. So it needs to be protected under another layer most of the time if I want it to last. I agree with someone else's comment about the breast pocket - pretty naff. I assume it's only there so they could have something to print the logo on. I'd be happier without it but not going to risk ruining the thing just to get rid of something that will be hidden most of the time. My cunning plan is that it's going to be part of the replacement of a down puffer jacket that I've gone right off because of their sponge-like properties. It'll be: Thin merino T, Nitro and OR Ascendant jacket, with my Alpkit Balance shell to throw on when it gets wet and windy (so, all the time in the UK ).