The Atomic Warden MNC 13 is a whole new generation of binding that will accept almost any sole you have on your ski boot standard alpine, Walk to Ride (WTR), GripWalk, and touring soles that comply with ISO 9523 standards. That's what the MNC is for - Multi Norm Certified. This binding was inspired by backcountry skiers who don't want to change their boots when they want to spend a day ripping the resort.