Lacing up a pair of these women's Flyknit Racer trainers from Nike is like wrapping your foot in a second skin. Designed for incredibly lightweight performance, a one-piece knit upper means seamless and stretchy support. With Flywire cables for a locked down, responsive fit without adding bulk, the entire shoe weighs in at an unbelievably lightweight 160g. Sat on a full-length Phylon midsole for agile cushioning, a Zoom Air unit at the heel keeps the foot loaded with springy, responsive energy for swift, light toe-off. A Waffleskin outsole equipped with a racing-specific diamond pattern delivers hard-wearing traction whether its three miles of thirty you're racking up.