While there aren’t any official numbers to show how many shoes have been sold, what we do know is that as of the tenth anniversary of the shoe releasing in 2019. The model had sold multiple millions of pairs. Which goes some way to show you just how popular these shoes are. As of 2014, there were 150 unique variants of this shoe and this has more than doubled since with the addition of slip-on, children’s and baby versions being added to the roster.