The tags have the size and product information on the inside of the shoe (behind the tongue). Real Adidas shoes will have tags with different serial numbers for the left and right shoe, but a fake product will have the same serial number.

Definitely runs large. I typically fit snug in a 6.5 and comfortably in a size 7, however, I bought these in a 6.5 and they are almost a full size too large. Too much length and width in the front. Really surprised, but perhaps go a half size down or use the option to try before you buy.

Look for the tag on the product which will have the size and other product information mainly inside the shoe that is behind the tongue of the shoe. Real Adidas shoes have tags with serial numbers for the left and right shoe. However, a fake product will have the same serial number on both shoes.