Hearing aid sweatbands also do a good job of keeping your hearing aids dry when doing something strenuous that will cause you to sweat. For running or doing exercise that requires you to wear your HA's so you can hear traffic, dogs, etc. I would get either Eargear or HA sweatbands. However, if you play a contact sport like hockey or football leave the aids in the car or bag, the shock from being hit could damage the aids as much or more than the moisture from sweating.