Adaptive Fit Last 102mm-104mm: Head"s newest boot technology is called Adaptive Fit. * 80/90 Flex Rating: This boot has a flex rating in the intermediate to advanced range, and can be adjusted between the two settings. * 30mm Power Strap: A velcro strap, 30mm in height, acts as an extra buckle to keep the top of the boot together. * Replaceable Toe and Heel Pads: This is a must-have for skiers that don"t live in ski in/ski out condos. * Soft Walk Heel: A rubber insert in the heel cushions while walking to get better grip and a more comfortable stride.