Regular iPod headphones don't stay in my ears. With these, they stay put just fine. The package comes with two sets of acoustibuds, one pair sized for iPods and one pair sized for Blackberry headphones. I found both pairs fit my iPod fine. The acoutibuds do pop off now and then and I've lost them a few times.

definitely kept me from throwing away my ipod headphones. they make them louder, fit snug into your dome and best alternative way for new shuffle users as the third-party headsets won't be available for a few months.