Features: Fitz-Rite midfoot has soft internal webbing to hold the foot secure. Lightweight molded counter comfortably keeps the heel in place during gait. Pressure Free Tongue designed to provide comfort and avoid irritation. Full ground contact outsole. Blown rubber forefoot, carbon rubber heel. The QU!K Spine is a carbon fiber plate that adds integrity to the midfoot. QU!K Flex forefoot engineering provides for natural and balanced toe off and enhances ground contact for better acceleration. Powered by QU!KFOAM.