The Nike Odyssey React Flyknit 2 Men's Running Shoe provides a strategic combination of lightweight Flyknit construction and synthetic material for support. Underfoot, Nike React cushioning delivers a soft, springy ride for a route that begs to be crushed. Features of the Odyssey React Flyknit 2 Running Shoe Nike React technology delivers a soft, smooth and responsive ride. Soft, synthetic material through the midfoot quarter adds support. Outsole geometry and Nike React technology work together to support your foot through your entire footstrike. Flyknit construction provides lightweight flexibility and breathability. Geometric, athlete-informed outsole pattern helps evenly disperse impact to provide a smooth transition and soft feel. Foam collar is molded for smooth comfort around your ankle. Give Your Feet a Hug Flyknit material contours to the shape of your foot, creating a snug, hug-like feel. With the bootie-style construction, the tongue is seamlessly part of the upper. This eliminates the pressure a traditional tongue puts on the top of your foot. Combined with the bouncy-soft feeling of React underfoot, it's like you're wearing slippers on a mattress.