Shop below for every collab and colorway of the coziest innovation in adidas history, the adidas Ultra Boost.

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The Ultra Boost is one of the most popular and important shoes in the history of the adidas brand. Released in 2015, it's been called the best running shoe in the world. With its distinctive look and impressive tech, the Ultra Boost gave adidas a big advantage over rivals in the athletic footwear world. Boost sole technology is made of Infinergy, a form of light, puffy, polyurethane that's basically welded together by heat. It's extremely efficient and comfortable. This shoe is very functional, thanks to the Primeknit upper, a heel frame, and a torsion bar in addition to the Boost sole. It's also been fashionable since the start, thanks to collaborations with big-name designers like Stella McCartney. There have also been Ultra Boost 4.0s designed to honor the different houses in "Game of Thrones." One of the most popular Ultra Boost models is the 4.0 in classic Running White. The Ultra Boost 1.0 in White/Red/White is also a fan favorite.