adidas dresses the Ultra Boost 4.0 with a combination of soft, complementary colors. They’re showcased on the ribbed Primeknit upper, one that adapts to the movement of the foot through each stride. A midfoot TPU cage, along with a molded heel cup, combine to deliver stability and structural support. A full-length Boost midsole in classic white is protected underfoot by a Continental rubber outsole for added durability and traction.