Adidas Men’s Pureboost 21 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. Regular fit Textile upper BOOST midsole Textile lining Rubber outsole Lace closure Adidas Men’s Pureboost 21 Shoes are responsive running shoes made with recycled materials. The soft knit upper comes with an external heel counter that locks your foot in place as you run down that last hill. Endless energy Adidas BOOST delivers incredible energy return and instant comfort with each step to keep you going. External heel counter An external heel counter locks down the foot for a secure fit. PUREBOOST feature The simplest expression of Adidas performance running, the Pureboost is a training shoe designed for short distances and everyday use.