Allmountain ski boots are the all-rounders for the piste and have an allround rebound. They come in various flex ratings. The flex measures the necessary pressure to bend the boot. In general, a lower flex rating, 70, 80 and 90, for beginners, a mid flex rating (90, 100 and 110) for intermediate skiers and a 110, 120 and 130 flex rating for advanced and expert skiers.