I posted a while back about a pair of Mares Quattro Power full foot fins which would cause pain after a while on teh outside of each foot where there is a bone. I returned them and got a pair of cressi full foot fins and i seem to be having the same problem..is it the shape of my foot, and has anyone else had this problem? I would purchase open heel fins but i'm afraid i'm gonna have the same problem when it comes time to buy a pair of freediving fins ive been wanting to get.