K2 Revolver Pro Ski Boots - 2023 The FL3X Revolver Pro is the preferred choice for freestyle skiers and is designed to handle anything you can throw at it. As the lightest freestyle boot on the market its no surprise riders flock to it. Strapped up with a Fully Heat Moldable Revolver Shell, 100 Flex Tongue, Intuition Pro Wrap and Alpine Soles. The Revolver Pro delivers reliable performance and comfort like nothing you’ve ever experienced.