I apparently have weird ears, because apple head phones, and most others, just fall right out of my ears instantly. With that being said, these Tarah pros have never fallen out. They fir perfectly, and also come with 3 different size ear tips. I always use them while I am running and lifting weights, and they stay in perfectly. I can honestly say that it would be impossible for these to fall out while running, regardless of how much you sweat.