Nike Air Zoom Vapor X Women's Tennis Shoes Still Blue/White/Bright Crimson : The Nike Zoom Vapor X features an improved upper enhanced with Dynamic Fit system made from a full-length TPU foot frame. This new construction offers more security during quick, lateral movements back and forth on the court. Zoom Air units provide more response and lightweight comfort underfoot. Upper: Textile material in the upper with sublimated graphic offers lightweight breathability and style. Padded tongue and heel collar enhance comfort. Lace-up front offers an adjustable fit. TPU footframe wraps from the lateral midfoot to the heel for stability during quick turns. Footframe material wraps the toe to enhance durability. Midsole: Dynamic Fit system wraps the midfoot and arch for a glove-like fit. Phylon midsole delivers lightweight yet firm cushioning and optimal responsiveness. Nike Zoom Air unit in the heel offers low-profile responsive cushioning. TPU midfoot shank delivers lateral support and stability. Outsole: Rubber outsole with XDR compound on the heel and forefoot provides multi-surface traction and durability. Generative design places added traction on the perimeter of the outsole to support explosive directional changes on the court.