"I am normally very easy to fit, so I was surprised how hard it was to break these sandals in. Initially, they were very, very tight across the instep -- and I don't have a high instep. With deliberate stretching, and wearing them a little while at a time, they eventually became tolerable, and now they're okay. What I was looking for was a flip-flop with real arch support, and this one does have very good arch support. But the instep is really tight, even on an average foot."