Built to take you from training to racing, this ultralightweight shoe sports a breathable upper with a wicked Boston Harbor print to motivate your every step. Brooks has added more responsive Bio Mo Go DNA cushioning for a dynamic ride and increased the midsole stack height by 2mm for more responsiveness. 1 1/2" heel (size 11) Speed: transforms impact absorption into propulsive energy with ultralightweight cushioning Cushioning: absorbs impact and distributes weight for consistent, buoyant comfort under each step Removable, cushioned insole allows for custom orthotics Bio Mo Go DNA sole fuses lightweight cushioning and rebounding rubber for a springy, responsive ride Textile and synthetic upper/synthetic and textile lining/rubber and synthetic sole Imported