Is not, first i ordered a size 12, one was good size the other one too tight.. tehn of course since they were so comfortable i got a pair in 13, .. well they were gigantic.. i wear from 12-13 in most shoe brands.. this were so big, anyway somehow worked that out with some foot-beads well the problem is that after a couple of months of using them the sole started peeling off.... and while i was able to contact the company.... and they ofered to replace i had to ship the ones i had so that in itself was a good chunk of the amount I paid for them... so great design poor quality and odd sizing, they have the potential to get 5 starts, just the crappy quality and odd sizing