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I bought this armband so I could use it in a triathlon I was running in. I work out a lot, and these were very tight for my arms. They are not elastic, and don't stretch, but once I got the band on, it was very stable and did not move. The quality is good, would be nice if it was more elastic. What does become an issue is the clear plastic part of the band gets stuck to the screen, which makes it a pain in the arse to take the iPhone out. I will use it again, but can not use it to lift weights because of the tightness around the arms, I wouldn't be able to bicep curls or tricep extension with them. Good for running though.
 
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