Nike designed the springy React foam technology with runners in mind. Determined to accommodate even the highest-impact stride, Swoosh designers used heat mapping technology to develop cushioning where athletes needed it most. Since then, Nike has capitalized upon the React foam success by combining it with other innovations. The Wmns Odyssey React 2 Flyknit 'Ember Glow' fuses the React sole with a Flyknit upper to create a versatile shoe fit for the road or the gym.