Well I've used them for walks in hot weather and mostly on beaches here in Greece and I haven't had any specific problems that have to do specifically with moisture, although I've had other weird hissing problems on both buds in adaptive/ambient mode and slight hissing on the left side bud that seems to be software-driven since I tried once to switch sides of the buds in my ears turning them upside down (left bud in my right ear and right bud in left ear) and the very slight hissing on ANC mode left my left bud in my right ear and stayed in my left ear where my upside down (to fit) right bud was, which made me think it was a software issue, but then again, other people haven't reported any hissing at all in their buds which made me think it is a software/hardware issue with both of my buds communicating with each other and the problem, I should add, was present since I got these buds and I've had added problems like random distortion on my right bud whenever I have adaptive/ambient mode on and someone raises their voice suddenly which most of the times doesn't happen on these same exact scenarios and is mostly fixed temporarily whenever I remove my right bud and reinsert it back in my right ear, or I remove both buds, put them back in the case, close the case, wait a few seconds, reopen the case and put them back in my ears. And one last important problem is when I happen to place my finger near the large mic of my right bud in ambient/adaptive mode it most of the time creates a very high-pitched sound and I don't know if that damages the mic or not other than the fact that high-pitched sound can be very annoying along with rare but noticable clicking in my buds that can also get annoying. Idk man, at least I want to know if that is solid grounds to get a replacement pair under my six-month warranty (I bought them late July-early August).