A 130 flex boot is a very stiff boot. For All-Mountain ski boots, and ski boots marketed to the general public, the highest flex offered is a 130 flex - which is suitable for very strong, aggressive skiers. Unless you find yourself overpowering a 110 or 120 flex boot, a 130 flex will probably be too stiff for you. , A 130 flex is one of the stiffest flex values you can find in a ski boot. That flex value is ideal for an expert level skier who truly values response and power transmission or a ski racer. , 130 flex is about the max stiffness for a recreational ski boot. Alpine racers may have stiffer, but you will not find anything higher than 130 on the regular market. The stiffness would be too much for a intermediate rider, 130 should only be considered by advanced/expert skiers.