adidasPureboost 21 TrainersSize & FitStandard fitAvailablein sizes 3.5-8 DetailsEnd use: RunningPureboost 21 Trainers by adidasBlackFor quick morning miles and more. Theadidas Pureboost 21 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 that locks your foot in place as you run down that last hill.Lace closureTextile upperBOOST midsoleTextile liningRubber outsole Material