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.

The bottom right or left of the front of the shirt will usually contain some sort of authenticity tag or a tag detailing the material type, but be warned! The look of these tags has changed considerably over time, and some adidas shirts don't include the standardised authenticity tag at all.

Adidas: Similar to Nike, Adidas sources many of its products from China, utilizing its mass-produced and specialized footwear manufacturing capabilities. New Balance: Known for its athletic footwear, New Balance has factories in China.