Size 10 Adidas Ultraboost 1.0 Crystal White / Core Black / Better Scarlet Lightly Worn Comfortable and responsive, Ultraboost became our first shoe to be as popular in day-to-day style as it is in performance running. The Ultraboost 1.0 Shoes feature the OG tooling that started it all, with an adidas PRIMEKNIT upper, BOOST midsole and Stretchweb outsole working together to give you energy return with every step you take.