Regular fit, Lace closure adidas PRIMEKNIT textile upper Cushioned feel, Textile lining BOOST midsole, Stretchweb rubber outsole Upper contains a minimum of 50% recycled content. For quick morning miles and more. These adidas Pureboost performance running shoes are so simple, you'll want to wear them beyond your daily run. With responsive BOOST, the comfort is clear as soon as you slip them on. The soft knit upper comes with an external heel counter, which locks your foot in place as you run down that last hill.