Spring-loaded Miles Amplify your run in the Brooks Ghost Amp. The propulsive forefoot pop of the SpringRamp, combined with DNA HYPE PEBA-blend cushioning, delivers a springy, responsive ride. All the technology works together in seamless harmony to deliver a fun, fluid ride that injects energy into every step. Features & Benefits: Amp up your run - New SpringRamp™ forefoot technology helps you push off the ground with forefoot pop and momentum. Energizing cushion - Nitrogen–infused DNA HYPE cushioning — a combination of PEBA and EVA — blends softness and responsiveness to pump up the thrill. Breathable and secure upper - Lightweight warp knit upper provides breathability and comfort, while also having structure to help secure the foot when picking up the pace. Neutral Support - Secure heel with dynamic forefoot helps provide inherent stability. Specifications: Category: Neutral, Roads, Responsive Trainer Weight: 9.0 oz. / 255 g Heel-Toe Offset: 6 mm (36 mm heel / 30 mm forefoot) Width: D (men's standard, medium)