Performance knitted fabric. Exposed QU!KSPRING material cushioning and responsiveness at a reduced weight to elevate the running experience with QU!KSPRING , a modified base EVA material. Lacing system. Multidimensional MORPHIT construction. Pressure-Free Tongue. Comfort Foam insoles. Open-cell Ortholite insoles. Eyelet design. Upper is knitted with a diamond design pattern. Plush heel collar shape. Recycled rubber.