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adidas teamed up with Arsenal FC and 424 for a special take on the Ultraboost 21. Kitted out in club colors, these running shoes have all the clean looks you'd expect from a design that bears the 424 label. With an adidas Primeknit upper, Boost midsole and stabilizing Torsion System, they also offer comfort, support and responsiveness across any distance.This product is made with Primeblue, a high-performance recycled material made in part with Parley Ocean Plastic. 50% of the upper is textile, 75% of the textile is Primeblue yarn. No virgin polyester.