With running comfortably for longer in mind, the 880 was built to provide consistent performance for the neutral runner. The Fresh Foam X 880v12 represents a new generation set-up of the silhouettes workhorse reliability with the smooth transitions of a reimagined dual-layer midsole. The top-bed foam and Fresh Foam X underfoot construction displaces heel impact and offers a responsive approach to cushioning. A plush, engineered mesh upper is infused with strategic zones of breathability and support. With the 880s 360-degree approach to comfort, you can keep going longer.