Others say...

"Great upgrade for any mp3 player to use while working out."
These headphones are definitely a great upgrade from the cheap ones that come with any ipod; they sound better, feel great and won't come off your ears.
I have read some people's reviews criticizing the sound quality... Come on! if you were expecting BOSE quality on 10 dollar sport headphones you will never be happy with any deals.
But if all you want is a set of headphones to use while working out that sound 100 times better than the set that comes with your Mp3 player, then this are the set for you... I even use these while shadowboxing and hitting the bag.

"Impressive"
For the price it's not possible to beat these. I use portable headphones while working out, and I've burned through many. In that environment, they're all disposible, but these hold up as well as any I've tried. Nothing in this price range can compete with the sound quality. My only complaint: the cord could be shorter. It's long enough that it jerks on the headphones when running. I just wrap the excess around my mp3 player which solves the problem. Other than that these are perfect (in fact, I ordered 2 more pair - now I'm set for a few years!)

"Good for jogging-"
I bought these strictly for jogging, and they do that very well. I wouldn't recommend them to an audiophile for intensive listening, because there's not much in the way of bass response and tend toward the mid-rangy side. They are pretty tough, and allow you to hear what's going on around you; a good thing when you do a lot of "street running." Nice and long cord, so you're not constantly unplugging them on the run. My only real complaint is that they are kind of a hassle to put on if you're already wearing glasses, but they won't come off once you get them on. I paid less than $10 (including shipping), and they're certainly worth that.

"Good for runners"
These are decent earphones and seem pretty good for working out. I don't think they are great on bass response but OK for non-audiophile listening. Biggest sales feature is for people like me whoose ears do not accomodate buds well. They have also proven pretty water resistant which for me is good as I frequently ruin my earphones with excessive sweating when working out.

"Great for running"
I needed headphones that would stay in my head while I was running and these do just that. Very happy with my purchase.