Breathable mesh upper provides the ventilation you need Seamless overlays add structure & support without adding bulk Heel lock down strap for improved fit Molded 4D Foam® footbed conforms to your foot's exact shape, eliminating slippage Full-length Micro G® foam turns cushioned landings into explosive takeoffs Foam is cored out to give you the right cushioning while allowing greater flex Strategically placed rubber traction covers high impact zones for greater durability with less weight