The new 4-Quattro Pro is the lightest weight, most powerful boot in its class. A new reinforced cuff works in conjunction with our Alpine Axial system providing a precise, high-performance alpine like fit. Our new Secure Speed Lock4 provides extra piece of mind and security when charging down a couloir, all while still providing 60 range of motion for long days on the skin track. Whether youre ripping bell to bell laps at the resort or on a mission deep in the backcountry, the 4-Quattro Pro was purpose built for free rides in search of the steepest, most challenging lines on the planet.