Great for running,
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This review is from: iPhone 4 4S Strong ArmBand Case Cover For SPORTS GYM BIKE CYCLE JOGGING, Tie Phone With Your Arm - by KING OF FLASH (Misc.)
Really good value product...however, don't make the mistake of wearing it if you are using weight machines because it can pull against your skin and cause bruising, as mine did when I used it on the bicep curl machine. Entirely my fault, I hasten to add, as if I'd been sensible, I would have realised that this might happen.
But perfect for listening to music when you're on the treadmill, bike or rowing machine. Touch screen still works well through the plastic cover, and it's fully adjustable.