The Nike Odyssey React Flyknit 2 Women's Running Shoe delivers a strategic combination of lightweight Flyknit and synthetic material for support just where you need it. Underfoot, Nike React cushioning delivers a soft, springy ride for a route that begs to be crushed. Nike React technology delivers a soft, smooth, responsive ride Flyknit throughout the forefoot stretches with your foot Synthetic material provides support through the midfoot Flyknit tongue gives a smooth, snug fit across the top of your foot Foam collar is molded for soft, smooth comfort around your ankle