The perennial, top-of-the-podium boot in major skimo races across the globe, the Alien 4.0 represents the pinnacle of lightweight ski boot engineering. The shell and cuff are crafted from hand-laid carbon fiber, providing ultimate strength and stiffness at a ridiculously low weight. The speed Lock Lite ski-walk mechanism is integrated with the cuff closure via a Dyneema® cord, for quick, single-action transition. The BOA® floating closure system is located under out Light Shield Tech gaiter, ensuring quick, easy and secure fit transitions. A Pebax® cap protects the toe area, while the Vibram outsole ensures traction on the snow for mandatory boot pack sections. When low weight, high speed and ultimate race performance are your priorities, reach for the Alien 4.0.