106 mm Last A comfort last for those with very wide and high volume feet * 120 Flex A stiff flex for expert or heavier skiers who require quick rebound and ski response. * QuadraFit Each liner is constructed using 4 different layers, allowing various combinations of mater * Cuff Alignment The cuff alignment system is easy to use and effective. It aligns the cuff to follow * Velcro Powerstrap