Flex is not something that you should pick randomly. Instead, there are precise parameters that you should follow. The flex of the ski boot depends firstly on your skill level, then on other factors such as height, weight, and foot width. The better you are, the taller you are, and the heavier you are – the stiffer ski boot you will need. These factors all contribute to the choice of flex.
As a beginner or lower intermediate skier, you should go for softer flex ski boots – they are a lot more comfortable and more forgiving, whereas expert skiers and racers go for very stiff boots, which give the benefit of responsiveness and efficiency. Keep in mind that stiff ski boots lack the comfort and warmth found in ski boots for novices. For example, if you are a 5’10’’ man at 150 pounds, you should probably start somewhere around 80 – 90 flex. That will be great for learning, but by the time you become an advanced level skier, you should move in the 100+ range for most applications.
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Low flex and comfort are recommended to beginners. Flex and ski boot fitting always go hand in hand to create a comfortable experience. Most beginners can get away with a heat-molded liner. So, if you are a beginner if you are a lightweight man try to start somewhere around 70. If you are a heavy man, try to start somewhere around 80. For women, the 60 – 80 flex range will do fine.