Having bought quite a few pairs of Adidas trainers over the years, I always opt for the same size. They are slightly too big, but with an insole inside, they are perfect. I bought two pairs of Adidas trainers recently. The first pair was true to size, but this product is very small made and I had to return them. Unfortunately, they don't offer a bigger size. Very disappointing. Sizing should be standardised, so you know what you're getting when you buy online.