I bought these only because I sweat profusely when exercising. I like to listen to my music from my phone while working out and loved it when I found out hearing aids have blue tooth nowadays.However, when on a treadmill, I sweat so much it gets in the hearing aid and shorts the battery within 15 minutes. I would constantly wipe them off, then my whole head after the first 15 minutes, then every two minutes until done. With these covers, the battery didn't short out once! Very impressed!We will see what happens when I ride my bike in the summer, but for now, I'm very happy with these covers.
Rating: [5 of 5 Stars!]