How can I sweat-proof a iPod Nano?

I'm thinking of buying an iPod Nano but there will be some situations where I will be wearing it under clothing that will be making me sweat more than usual. My current MP3 player gets a little moisture on it but it survives (but I am retiring it - a ZVM - because of it needing my laptop to be always on to recharge). I hear moisture can wreck an iPod Nano but I didn't hear just how much or how little moisture it takes. Is there anything that can cover an iPod Nano to protect it from sweat when it's close to the body under multiple layers of clothing?

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sweat shield

Neautrogena (did I spell that right? Oh well, you know what I'm talking about. ( NaturalVolume. It has a nice brush so you get every lash and you just need a couple of swipes for both eyes.

I don't know about sweat proof, but just curl your lashes so your mascara doesn't smear on your eyes or lids!

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Doing Business in Belgium