GSI Cool Sealed Waterproof Adjustable Armband Bag for Underwater Swimming/Sports/Surfing/Skiing/Fishing, Protects Apple iPod Nano and Most MP3/MP4 Players - Includes Custom Waterproof Quality Earphones
I'll keep this brief as this isn't worth anymore of my time.  It's not waterproof. The seal where the wire goes inside the unit and plugs into your player is cheap. Even though mine lasted about 1 minute before drowning my zune, you could tell it's so cheaply made, if it doesn't leak immediately, i'll leak soon.  I was under the impression you could change the earplugs with an aftermarket headphone, due to the suggested items to purchase with this, but that isn't true.  Oh.. i should also mention, on my fir