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Incase Sports Armband Deluxe
If you're the sporty type and like to have your iPhone close to hand while you run, jog, cycle, pound the treadmill or whatever else you do to keep yourself in trim, you'll need a case specially designed for your active lifestyle. The Incase Sports Armband Deluxe is just what you are looking for.
Constructed from tough neoprene, the case protects your iPhone while you're working out, yet still allows you to interact with it through the clear front panel.
This is also one of the most comfortable armband cases for the iPhone that I've ever tested. I find that most are either become too sweaty after a short period of time, or cut off the circulation to my arm. I had no such problem with this case.
Note that this case is NOT suitable for swimming!
Fits both the iPhone 4 and 4S.
Image credit: Incase