Cushioning in running shoes is the material—usually foam, gel, or air systems—built into the midsole to absorb and disperse impact forces every time your foot hits the ground. By softening these forces, cushioning reduces stress on your feet, muscles, and joints, which can help lower injury risk and fatigue over time.
Modern midsoles are engineered not only to absorb shock but also to return some of that energy, making each step feel more efficient and responsive. Choosing the right level and type of cushioning is key for comfort, performance, and how long you can run before your legs start to feel beat up.