Headphones for underneath "ear muffs"
I currently only have a pair of noise canceling headphones, which though they sound fine and I'm happy with them, I cannot wear them when I'm playing drums. I like to play along with songs I like, but since I also like my hearing, I wear Vic Firth db22 practice isolation headphones. What I've been doing is borrowing a pair of my sister's iPod headphones and wearing them underneath. Then I can listen to the song on half volume, wear my ear muff protection over them, and still hear my drumming and the songs drumming. I would spend the $60 or so for the Vic Firth isolation headphones that are actually headphones, but I can't really wear those running/biking/walking outside. They're also impossible to wear during the winter when I need to wear a hat.
So I'm looking for something that's obviously better than the stock iPod headphones, but about the same size so that I can wear them underneath my drumming headphones. On the cheap would be nice too.