There seem to be very few fully portable, fully around the ear headphones. This means that for people like me who want to bring headphones to and from work or school everyday and wear them all day, there are very few choices.
There are a number of headphones that go around the ear for some people but not all (Momentums, Onkyos) and some full size headphones that fold a little but not enough for great portability (SoundMagic HP100).
The only two I can think of that fit around around most everyones ears and are truly portable are the NAD HP50s and the AKG 545s. Am I missing any? Why is this segment so underserved?