Its all about the over-ear mate.. over-ear..
I have bigger ears and a get a lot of discomfort from most headphones. I have a pair of Audio Technica ATH-A900X (with huge cans) at home, but I'm always hunting for a cheaper pair to carry around with me.
My ears are huge, they fit very well within these earpads. By comparison I use the Beyerdynamic DT770 as my music headphones (vs travel) as those are the only ones I've tried so far that fit my ears and are super comfortable.