Breathable mesh upper with synthetic overlays for added structure and support Reinforced air cushioning around the ankle collar for superior comfort Deluxe Comfort System insole adapts to your foot for optimal comfort. The Charged Cushioning midsole offers all-day comfort, as well as enhanced responsiveness and durability. The durable rubber outsole offers traction and durability, as well as flexibility where you need it to get going. NEUTRAL: For runners who need a balance between flexibility and cushioning.