It's down, so probably not due to the moisture from your body. I've done light trekking with the regular uniqlo down jacket, but I don't think it would be right for high intensity.
Have a look for ones with primaloft as that's synthetic. If you know someone going to the US there's an outdoor shop that does own brand jackets with primaloft at a low price. I can't recall it off the top of my head, but could work it out if it's useful.
It's down, so probably not due to the moisture from your body. I've done light trekking with the regular uniqlo down jacket, but I don't think it would be right for high intensity.
Have a look for ones with primaloft as that's synthetic. If you know someone going to the US there's an outdoor shop that does own brand jackets with primaloft at a low price. I can't recall it off the top of my head, but could work it out if it's useful.