For mine, one side fits nicely. And the other is a little loose. But it’s doesn’t come off easily when walking. So I guess it shld be fine as long as it’s not dropping down?Hi! i just bought a pair of dioract sandals tts (35.5) and it seems like the fit is okay. I was wondering if the back strap sits firm with your heel? Mine are a little loose but when i try to shake my foot, the sandal isn't moving which is good. Not sure what to do since there isn't a boutique close by