Since first debuting in 2015, the adidas Ultra Boost has become one of the most popular models in the brand’s catalog. Given its massive popularity, the model has been remixed over the years with new upper patterns, materials, and more. This tonal colorway of the Ultra Boost 4.0 sports a grey Primeknit upper, tonal TPU Three Stripes cage, and a matching heel cup with metallic silver branding. The sock-like upper sits atop a white Boost midsole and black Continental rubber outsole to create one of the most comfortable shoes on the market.