I own a pair of these, they're great (and only $50). But I wouldn't wear the for riding. They are BIG, and while the sound is orgasmic for the price, the chassis is VERY cheaply made, You could snap these things in half easily, and you're hard-pressed to find anything other then cheap-ass plastic on em.
And you can't fold them. I still reccomend these highly, but more for chilling and stuff (on bus rides, in cars, etc). For good riding junk, get the SkullCandy Smokin' Buds. Awesome sound, incredible fit, $32. Nuff said.