Winning marathons since the '80s, a track icon makes a sleek, modern comeback with the Women's Nike Air Zoom Mariah Flyknit Racer Shoe. Constructed with a Flyknit upper for a sock-like feel, it features an inner bootie and a Zoom Air unit to get back to its race-day roots. Flyknit constructed upper provides a snug, sock-like fit. Bootie construction offers easy on and off. Zoom Air unit delivers responsive, low-profile cushioning.External TPU heel counter helps lock the heel in place for a secure fit. Thin rubber outsole enhances durability.