Get more of a good thing in the Endorphin Shift 3. With a higher stack of PWRRUN foam and a deeper midsole cradle to sink into, it makes your training plan feel like vacation mode. - Get to know the softer side of SPEEDROLL Technology with an extra 2mm of PWRRUN foam and an elevated PWRRUN+ sockliner. - Durable and lightweight mesh pairs with a streamlined heel clip for support that doesn’t weigh you down. - With a new centralized torsional heel groove, you can touch down and roll forward more easily than before.