Sensor Inside: 3 contact points (metatarsals / heel). Cutaways in the bootboard. Direct contact between liner and the shell. The Sensor Inside bootboard is narrow, so that the 3 contact points (metatarsals and heel) can be in direct contact with the boot shell. This increases power, control and feel. A 97 mm internal last gives a very close, very precise fit for expert skiers. Comfort Fit Liner: Anatomical padding with the emphasis on comfort.