Single-layer open mesh upper allows for lightweight breathability and water drainage. Arch bandage supports the midfoot, improving the fit without added weight. Neoprene collar which is built in to the tongue for a sock-like fit on the ankle, the material maintains its performance capabilities even when wet. Sockliner perforations reduce the weight of the shoes for better performance. Lightweight Phylon midsole delivers cushioning during foot strike while a carbon fiber shank in the midfoot offers structure and flexibility for improved response. Pebax spike plate is split in to 2 articulated pieces for smooth and flexible lateral to medial transition Fixed 5-pin spike layout provides a closer to the ground feel than screw in spikes and reduces the overall weight of the shoe. Ideal for Mid distance Steeple races.