They stay in my ears even when I'm running quite hard, for example during a threshold session. The asymmetrically hanging control unit seems a bit awkward at first, but it didn't bother me at all. But if you work hard on the treadmill, you will sweat a lot. Unfortunately, Urbanista Berlin cannot handle this. This sometimes resulted in them lasting 20-30 minutes after being plugged in all night. The longest I've gotten from them so far is 1:32 which is less than the advertised 4 hours but really if they could guarantee it every time I'd be happy. They don't. Considering that treadmill running was the main and only use case I bought these headphones for, that's not good at all. I really give them 2 stars just because I like them.
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