The first Mach boasted the HOKA ONE ONE trio of benefits: maximum cushion and super responsiveness in a surprisingly lightweight package. The Mach 2 goes a step further with its PROFLY midsole. That's a PROFLY midsole made with rubberized foam, which makes for an even lighter and more resilient ride. And it uses an engineered, breathable mesh upper atop the responsive, stable package. This shoe is as fast as lightning and ready to race.