RUNPRO series offers deep heel cup for a better in-shoe fit. The triple layers provide an optimum moisture wicking barrier; which decreases the chances of blisters forming. The top layer is made from supportive microfiber. The mid-layer is Freeflex Memory Foam, which adjusts to the foot and is filled with high-quality bamboo charcoal. The bottom layer is a unique mix of natural rubber and EVA, giving an active foot the space it needs – when it needs it. The 3D dynamic arch technology is made from a nylon composite that adapts to the foot’s natural motion without compromising performance; and is available is 3 arch profiles…High, Medium and Low. RUNPRO is engineered too, with a decoupled heel to reduce pronation. The PORON metatarsal cushioning makes the propulsion phase of the gait cycle effortless.