Mizuno Wave Rider 15 Limited Edition Ruby/Crystal : Neutral. Providing the cushioning, durability and flexibility for the best ride ever, Mizuno's Wave® Rider™ 15 returns to the fit, feel and performance that has made the Wave® Rider™ Series a franchise unto itself. Upper: AIRMesh™ with synthetic overlays for support provides the utmost in breathability and comfort of the upper. Dynamotion Fit™ relieves the stress the foot naturally places on footwear and eliminates distortion in the collar and heel during the gait cycle for a perfect fit. Midsole: The Mizuno Wave® is a leading footwear technology that combines cushioning and stability, two distinctly different elements that are both inherently necessary in great running shoes. Gender specific engineering is a philosophy to maximize performance by tailoring footwear to the separate needs of men and women. Women's gender specific engineering provides a Flex lines in the heel and forefoot. The Mizuno Wave™ is SmoothRide™ Engineered. This SmoothRide™ Engineering approach is used to minimize the rapid acceleration and deceleration of the foot during transition, creating the smoothest ride possible. AP+ enhances the inherent properties of the AP midsole, offering increased rebound and a bouncier feeling, which extends the cushion durability, while maintaining the light weight performance. VS-1 Shock-absorbing cushioning compound is found in the heel to absorb the forces from heel strike. The Mizuno Intercool Full-length midsole ventilation system reduces heat and humidity build-up inside the shoe. A removable sockliner provides a responsive first feel. 24mm heel height, 12mm forefoot height. Outsole: X-10™ featured in this shoe is the most durable carbon rubber that allows for longer wear in high impact areas and supplements traction at heel strike. SmoothRide Engineered, a solid rubber forefoot outsole design for durability and cushioning, now with flex controllers built to optimize flexibility. Available in width B (Medium). Recipient of the American Podiatric Medical Association Seal of Acceptance, which recognizes products that have been found beneficial to foot health, and of significant value when used in a consistently applied program of daily foot care and regular professional treatment.