These things changed my perspective on ski boots. It's one ofthose rare times where all the tech talk and marketing schemes turns into something beneficial and noticeable. I have very bowed legs and with the molding process the boot forms right to the curve of my calf. I definitely notice this in my knees when I'm locked into my skis as they flex straight towards the tip rather then into the center of my stance as with other boots. This can be translated into many different things as the boot let's you stand on your skis they way your body personally works not just the average. The biggest downfall of these boots is the high price combined with the fact that they only lasted me one season (about 120 days). Apparently this issue has been fixed and was a direct result of the yellow dye but I can't comment personally as to that.