The adidas Ultra Boost is a popular running sneaker from adidas. Originally debuting in February 2015, the Ultra Boost has since become one of adidas’ most popular shoes, finding a home with both style-conscious sneakerheads and runners who demand exemplary performance due to its comfortable and modern combo of a Primeknit upper and Boost midsole. Prototype after prototype. Innovation after innovation. Testing after testing. Meet us in the hot pursuit of the pinnacle harmonization of weight, cushioning, and responsiveness. Ultraboost 21. Say hello to incredible energy return.