The Kiprun KIPSUMMIT MAX is built for the long haul, taking everything that made the KIPSUMMIT great and dialing up the comfort with a fully padded collar, tongue, and upper plus a high-stack platform that keeps legs feeling fresh deep into a hundred-miler. FASTECH+ foam with 21% more energy return than the previous version keeps the ride responsive rather than mushy, and a Vibram Megagrip outsole with integrated lace keeper means traction and security are never a concern no matter how many miles are on the clock.