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.

Running shoes for long distance are made with advanced cushioning for support and energy return and textured rubber outsoles for grip in a variety of conditions. The adidas adistar, adizero adios Pro and Supernova+ are all excellent choices for long-distance running and marathon training.

Adidas sizing is generally true to size. The label themselves advise that for a more loose feel, you should go up a size or, for a more snug fit, try a size smaller. These are, after all, relaxed sports-oriented pieces that need to fit your particular lifestyle.

The name adidas came from the founder, Adolf “Adi” Dassler's name. He used his nickname, Adi, and the first three letters of his last name, Das, to create adidas.