Control works from the center of the ankle bone down. The custom foot bed with out any foam make for spot on initial control side to side. The cuff does not need to be much more than 25mm above the center of the inner ankle bone to offer addition detention pressure side to side. Sometimes due to injuries or calcium deposits the bones are taller and yield a taller boot. Some ankle bones are super low and some super high so boots have to be built according to the user for optimum performance. The top strap on my boots can be made static which will have a definite pressure to the front of the ski point like the limiter straps on some of the Reflex boots, and by just removing one carriage bolt the strap will move forward and backward more freely with the dorsiflexor still putting pressure on the tip but not so pronounced.