I just recently purchase the Mens Rainbow Sandals Premier Leather double stack in black after purchase a Mens single stack in brown 8 month before . one of the complaint I have about the single stack be that there be not sufficient support where my heel be . however , the double stack be incredible ! there be so much support and cushion that I could walk for hour and hour in they ! I will never buy single stack again . Rainbow 's be the best and I will never waste my money buy any other sandal ever again ! -lrb- by the way , I be a woman who wear a size 10 in woman 's in the US . I have find that Mens large rainbow fit I best because my foot be not only long , but also wide . -rrb-