What Our Gearhead® Experts Are Saying: "I’ve ridden the Revolve KF and it’s a beast—stiff, responsive, and built to drive freeride skis hard. The Intuition Pro Wrap liner locks in the fit, and the progressive flex makes it feel smooth even when you’re hitting drops or charging fast lines." When the mountain is your playground, you need a boot that matches your ambition. The K2 Revolve KF Ski Boot—designed with pro rider Karl Fostvedt—delivers freeride-ready performance with one of the stiffest FL3X builds to date. With a 130 flex and a precise 99mm last, this boot is built for skiers who demand control, responsiveness, and stability at top speed. Every detail is engineered for freeride power. The Revolve Plus shell and TPU construction provide the strength to drive big skis, while the Intuition Pro Wrap liner offers a fully heat-moldable, locked-in fit for maximum energy transfer. An elastic cam strap adds extra responsiveness, and GripWalk outsoles make hiking lines or scrambling on rocks safer and easier. Whether it’s pillows, spines, or big mountain lines, this boot is tuned for those who send it from dawn to dusk.