The innovative Nike Unisex Flyknit Racer Running Shoe gets its structure and support from Nike Flyknit technology. As a result, it's incredibly lightweight, with a precision fit that feels like a second skin. It's no wonder the world's best marathon runners are wearing it in competition.The shoe features a single-layer upper to eliminate overlays and reduce weight as well as a waffleskin rubber outsole with racing-specific diamond pattern for lightweight durability and traction.Features Include:A single-layer upper eliminates overlays reduces weight.Each loop is designed to expand or support as needed.Knitted construction process uses only what’s needed.Waffleskin rubber outsole with racing-specific diamond pattern for lightweight durability and traction.Forefoot Nike Zoom unit and full-length Phylon midsole for lightweight responsive cushioning.Weight: 5.6 ounces (men's size 9).Polyester Text.