The Experience Sensor3 120 has a medium 100mm fit with a firm 120 flex index for strong expert all mountain skiers. The Sensor Fit liner is a true lasted liner to address the common problem fit areas. The seamless one piece tongue and cushy cutout instep pocket eliminate pressure points across the tops of the toes and that pesky instep bone. The boot board is rubber for shock absorption and grippy rubber heel gives extra traction for walking around the resort. Aggressive expert all mountain skiers will excel in the versatile, powerful and comfortable Experience Sensor3 120.