The TRABUCO? MAX 4 shoe is designed to help you navigate the trails with less effort.FF BLAST? PLUS ECO technology is placed in the midsole to create effortless impact absorption while propelling your momentum forward. This material also creates a more dynamic feel that helps keep the shoe lightweight.GUIDESOLE? technology is strategically positioned to create an easy forward roll. Additionally, it's scientifically proven to help increase your potential to run further while using less energy.