The Soma Vacuum Hybrid 12 Plus has three-settings: hike, ride and a race-performance lock mode, which gives the boot a 120 flex. The last can range from 98 mm to 108 mm thanks to Fischer’s VacuumFit technology, which custom molds the boot shell through a heating process to fit the contours of each individual foot and lower leg. Note: this boot's last size can range from 98 to 108 mm.