What boot flex do I need?

Put your weight, ability and stance into the calculator above and you get a range of flex numbers to start a fitting from. This page explains where that range comes from and why it is a range.

Ability sets the centre. A first-timer starts around 65, a beginner around 75, an intermediate around 95, an advanced skier around 115 and an expert around 130. Your weight moves that: a heavier skier bends the cuff more, so wants it stiffer. In the picture above, an intermediate at 80 kg lands at 85 to 105, and at 110 kg at 95 to 115. A forward, aggressive stance adds 5 because you load the cuff harder; an upright, back-leaning stance takes 5 off because you will not flex a stiff boot at all.

Now the caveat that matters most. Flex numbers are not comparable across brands, and often not across one brand’s own models. A 110 from one maker can feel softer or stiffer than a 110 from another, and there is no standard test behind the figure. A women’s 100 is not a men’s 100 either. So treat the range as a place to start, not a number to shop by.

Stiffer is not better. A boot that is too stiff for you will not flex, which tends to leave you sitting back with burning quads. A boot that is too soft collapses under load and gives you no support when you push. What you want is a flex that bends smoothly as you push into it, in a shell that holds your foot.

That is why fit comes first. A perfect flex in a boot that is too big still loses movement; see how a loose boot steals your edge. Pressure on the instep, a bruised shin or a heel that lifts are what you feel, and they are things to tell a fitter. If something hurts, rather than just feels off, that is a conversation for a physio.

We do not recommend boot models, because the right boot is the one that fits your foot. Take the range, and your stance, to a boot fitter. Ask them to let you flex a few boots from different brands, and choose by how they feel.