PROTECTS AND REGULATES , FROM START TO FINISH. In the X-SOCKS® X-Factor we have a sock in our range that is the perfect choice for all those who have treated themselves to custom foam-lined ski boots. Even sprinters and proven technical specialists prefer this sock with its thinly worked leg. The X-SOCKS® X-Factor provides the fi ne feel skiers need for the ski and edge. A perfectly moulded foam liner in the boot eliminates the need for a calf cushion, even for good technical skiers. Features the X-SOCKS® X-Factor does not dispense with, however, are the stabilizing X-Cross® ankle bandage, the pressure-relieving shin protector and the AirConditioning Channel®, including Traverse AirFlow Channel System™, which is responsible for effective air exchange and dry feet. Heel, forefoot and Achilles tendon protectors round off the protection package of these high-tech socks.