Every time I go to the gym, most of the folks there are using an iPod of some sort. Many of the people are wearing the iPod holders that go on the arm too. The thing that I always wonder about is sweat.
It's seems that germs and bacteria would be an issue after wearing the armbands for a while. iSkin has a new armband designed for the 5th generation iPod nano that has integrated antimicrobial protection.
The device is integrated with Microban to inhibit the growth of microbes that can cause odor and stain. It helps keep your armband from getting all funky, which is a good thing for all the folks in the gym near you.