Update to the original Runners World ‘Best Debut’ award-winner, this mild-stability shoe features a newly constructed internal fit sleeve for enhanced support at mid-stance. Lightweight and seamless double jacquard mesh for maximum ventilation and comfort. Forefoot offers a newly designed vamp with more volume promoting natural foot movement and increased efficiency. MORPHIT Sleeve construction contours to the foot providing a supportive superior fit. Pressure Free Tongue is designed to provide excellent comfort avoiding any chance for irritation during flexion. Dynamic stability is achieved by pairing a medial post with our integrated lightweight QU K Spine shank for support. QU K Flex 4Foot Engineering provides for a natural and balanced toe off and enhances ground contact for better acceleration Powered by full length QU KFOAM midsole to provide excellent cushioning and a smooth comfortable ride.