It's the two finger rule for the "average" rider. You pull the liner out shove their foot in the shell push their foot till the big toe is touching the shell shove your hand down the back of their calf with your index and middle finger pointing down. If they both fit in there snug between the heel and the shell that's your fit. That's a ski boot fit. Snowboard boot you want 1 finger for the 'average' user. If you want a performance fit you ideally want none.
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Because someone has to call it how they see it!