Drawn from a special collection designed for the 2021 Tokyo Olympics, the adidas UltraBoost 21 ‘Tokyo’ carries a white Primeknit upper made in part with Parley Ocean Plastic. Performance attributes include a molded heel counter for rearfoot stability and a full-length Boost midsole with 6% more Boost capsules than previous Ultraboost models. Underfoot, a Stretchweb Continental rubber outsole is accompanied by Linear Energy Push, an updated version of adidas’ Torsion system that yields a more responsive ride.