How could the iconic Ultraboost get any better? Here it is, with all of the premier features from those heritage running shoes, including foot-hugging adidas PRIMEKNIT and responsive BOOST cushioning. Made with a series of recycled materials, this upper features at least 50% recycled content. This product represents just one of our solutions to help end plastic waste. Regular fit. Lace closure. adidas PRIMEKNIT upper. Fitcounter moulded heel counter. BOOST midsole. Textile lining.