In reply to UKC/UKH Gear:
I've been using one of these for the last year and genuinely think it's a really innovative bit of kit (despite being perhaps a little sceptical about how well it would work at the start). During the Scottish winter I used it as a thin shell layer to wear on the walk-ins when it was slightly damp or snowing. Prior to this I’d wear a lightweight running jacket, but with this I found that whenever we stopped to fill up water/work out where we were going/faff etc, I'd quickly get cold and might have to throw an extra layer on. With this jacket I've found I just about stay warm enough that I don't need to anymore, whilst also maintaining a comfortable temperature while moving.
More recently I took as my shell layer on the Peuterey Integral. Conditions were looking windy and I wasn't sure how well it would stand up abrasion-wise moving over lots of alpine rock, so it did feel like a bit of a gamble in order to save a bit of weight. On the first morning it actually rained consistently for the first few hours (which wasn't in the forecast), but I managed to stay dry enough in the jacket. We were moving fairly quickly, but for almost the entire climb I was just wearing this over a thin baselayer, with a lightweight down jacket to throw over the top whenever we stopped. I did also take a fleece midlayer, but I probably could've got away without it. There was no visible abrasion damage after the route, although obviously it’s not going to hold up as well in the longer run as a heavier-weight shell.
As my work involves working with various brands I try and avoid shouting about kit unless it's stuff I actually think is really good, but this has definitely been an item of kit that's really impressed me recently. It’s perhaps a bit of a niche item, and not something you’d get if you were just buying one jacket to cover all bases, but I think it's a concept that works incredibly well in certain scenarios. If it came in some brighter colours then it’d be even better!