SHOE SIZE: B = Medium width, D = Wide width FOOT SUPPORT: Ideal for runners with a medium to high arch looking for neutral support. BALANCED, SOFT CUSHIONING: BioMoGo DNA and DNA LOFT cushioning work together to provide a just-right softness underfoot without losing responsiveness and durability??yet it feels lighter than ever. SMOOTH, STABLE RIDE: The Segmented Crash Pad is designed to adapt to each foot fall, so no matter how your foot lands, you??ll enjoy the smoothest ride possible. SOFT, SECURE FIT: The newly engineered mesh upper practically disappears on foot with strategically placed stretch and structure where you need it most.