Nike AeroSwift Women's Running Singlet - Black The Nike AeroSwift Singlet provides lightweight freedom of movement while running. The open-mesh design keeps you cool when things get hot while running. This product is made from at least 75% recycled polyester. Low weight and mobility Nike AeroSwift technology combines innovative elements and materials with a precise fit for excellent mobility and lightweight comfort so that you can perform at your best from start to finish. Special cooling Sweat-wicking technology keeps you dry and ensures comfort. The material of the top is light and has an open design that allows ventilation. Keep moving Racerback straps and a cut that reaches to the hips ensure maximum freedom of movement without distractions.