Model : NIKE US8262017 New Nike Sock Dart BR Mens Shoes BlackWith an engineered knit upper, the Nike Sock Dart BR offers a sock-like fit and locked-down feel. Engineered knit upper is flexible and breathable. Molded midfoot strap has an adjustable closure for a personalized fit. Phylon foam midsole offers cushioned comfort. Duralon rubber outsole has flex grooves to enhance flexibility and reduce weight.