Well the one I have in mind is Audio Technicas Solid Bass WS55 which has a similar sound signature to the FX101. You can read about them here. They aren't fold able but are built strong good isolation and truly one of the best sounds for portable headphones. http://www.head-fi.org/t/567012/the-portable-bass-kings-the-pioneer-hdj500-vs-akg-518-le-vs-the-first-look-at-the-new-at-ws55-solid-bass#post_7678587
JVC MA-HA750 were absolute beasts for me before i cracked them in an overpacked suitcase. Not sure if the are still made but outstanding bass and great mids and good treble. Cracking set of over ears and wearable in public......... cant reccomend them more highly. Comparable (but better sounding than the 101's).