Brooks Men's Mach 13 Spike Cross Country Shoe Rubber sole CMEVA Midsole - A full length compression molded EVA designed midsole, for lightweight cus Synthetic Overlays - Strategically located to provide a secure, customised fit. Air Mesh upper - Allows the foot to breathe, letting heat escape from the shoe. Dynamic Arch Straps - Located in the midfoot, which provides a more secure fit. Strobel Last - Utilises a full length layer of foam to provide cushioning and flexibility.