The adidas Originals Superstar 2 - Men's, are listed on the website as US sizes. When you choose a size, it will be the US size. The UK equivalent is listed on the sizing chart (in case you needed a UK version/size).
Unfortunately, there are no planned orders to replenish any of the sizes for the men's adidas Originals Superstar 2 shoe in the White/Zest/White colorway. This particular style will be sold out once stock is gone.