Title: Great idea.... LOVE it!
Review: This arm band is wide enough to wipe sweat with one swipe and has a water proofish lining on the pocket so "smart" keys do not get destroyed from sweat. I wear this for every long run. Key goes in the inside and I tuck 4 gatarade single shot mix underneath to add to the water bottle.I wear in on the wrist, not like the guy in photo... may be tight around a bi-cep with stuff inside of it.Bought 2...
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