Creating a classic sneaker is hard. Every year, a dozen models or more come out of the big sneaker brands only to fade into obscurity once the next Jordan collab comes out. Even harder than that is trying to improve and build on a classic sneaker. This is the loop that Adidas has been in with their Ultraboost line. While the Ultraboost 19 and 20 were not the commercial success Adidas wanted, they have another try with the Adidas Ultraboost 21. Is this another classic, or is this more Jordan 33 than Jordan 3?