They work as advertised. Stay in your ears and really sweat proof. I've tried numerous other brands advertised as "sweat proof" that fall out of my ears and/or stop working by the time the first drop of sweat appears. Not with these. They stay comfortably in your ears for hours without adjustment and even during your toughest workouts. However, the sound quality is not bad at all. No comparison to my expensive full-size studio headphones, but absolutely stunning compared to standard Apple White headphones. Finally a real sports headphone that really stands up to the sport.
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