Looking for comfort, performance, warmth all day long and of course security.
Fisrt of all, the ski boots are made according to a standard foot, but we all have different feet, calf and bones. Then, the room inside is not the same if we speak about a racing or a beginner boot. The rigidity has to match the level and the type of ski practice : freeride, racing, leasure... At last, A snug ski boot, close to the foot will be more secure and efficient to avoid a twisted knee or ankle.
So that means, it's always very difficult for everybody to find the right ski boot. We all need boot-fitting.