I doubt their authenticity. It says "big kid" first, but they're definitely kid sizes. I bought "9 big kids" and they are 9c and fit my 2 year old. I compared these adidas to my daughter's adidas that I bought from a retail store and found that the stitching is slightly different, the logos are in different places and they are made in a different country. Still, for the price, they do the trick. You look good but only time will tell.
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