The Nike Joyride Dual Run is designed to help make running feel easier and give your legs a day off. Tiny foam beads underfoot contour to your foot for cushioning that stands up to your mileage. Contouring Cushioning Small foam beads are contained in 2 compartments under your heel and midfoot. They compress and adapt to your every step for better impact absorption and a stable feel. Enhanced Breathability Mesh wraps your foot in lightweight support. It lets air flow freely for cooling comfort. Zoned Durability Durable rubber is placed on the outside in high-wear zones. The raised nobs add traction.