do not buy these sandal ... I purchase a pair of these five year ago and they be great . the nob do not come off ... the strap finally break loose after three year of use . I just purchase a new pair in June and by August most of the nob be off already . they be almost unusuable at this point . I write to the Adidas to let they know that the quality have go downhill and get a ` corp-speak ' response but no answer or even willingness to admit they have a bad shoe now . see update below : recently , a friend of mine buy the Adidas Men 's calissage , with the clear nub , and they have not lose any nub in over three month . they seem to be about the same as this version , just better make nub . I would recommend go with the calissage ... if you can find it in you size . I check on Amazon and they be out of many size .