I was around a pool so maybe its chlorine but only affected one shoe. Oh well I know what to expect from now on. And had to take it off. I use them for work when Im on my feet for 10 hours. Got this on sale, and is honestly the best thing to get if youre looking for a simple, no-frills ambidextrous (or just a left hand) mouse. Muy bonitos con mi note 10 blanco con vinaron de maravilla (mystic White). I have not found any flaws so far. I must say I underestimated them from the beginning to be totally honest. ??Sono state aggiunte 5 modalità di allenamento tra cui cyclette, ellittici e yoga. A990Z (open soundstage perfect for classical music, mids can shout, somewhat confusing, not portable)3.