Great sandals with nice side and arch support.  They don't flip or flop for me.  I have been wearing these for years and have every color.  Friends and family members tried my Oofos and immediately ordered them too.  One thing a prospective buyer should know is the sizing.  The UE size is correct.  I always wear a 6 in regular shoes and a 36 in European sizing.  The Oofos sandals that fit me are UE 36 but are given an American equivalent of a 5.  That is so wrong. I've never been a 5 in my life.  My daughter who normally wears an 8 - 81/2 in American wears a size 7 American in Oofos.  My advice is to use the UE sizing chart.  That's the reason some people say the shoes run large or small or fit as expected.