Nike Nike slides

Nike slides they say they are a size 15 but I wear and 11 and they fit me good . I don't know what's up with that but most definitely not a fifteen as they are markes. I do not have box but I will ship next day. They seem like a 12 to me so that is what I'm marking ... please realize they do say 15 before buying but I wear an 11 and u see the picture.