A top layer of our premium PWWRUN HG foam is molded with supercritical process to enhance energy efficiency with a durable bottom layer of PWRRUN PB which combined provides a snappy and bouncy underfoot feel. Speedroll technology combined with our proven and stiffest full length Carbon Fiber plate engineered in a unique shape to provide quicker turnover from start to finish. Ultra-thin layer of XT-900 carbon rubber for excellent traction and durability. A breathable and airy single layer mesh with attached flat knit tongue for a comfortable sock-like feel.