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® Fit System floating closure is located under out Light Shield Tech gaiter, ensuring quick, easy and secure fit transitions. 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.

• Carbon Fiber Cuff: Hand laid carbon fiber cuff for the ultimate in lightweight rigidity, with Pebax® overlapping front panels for a contoured closure
• Carbon Fiber Shell: Hand-laid carbon fiber shell is super stiff and crazy light, with a protective toe cap
• Speed Lock Lite: Simple and secure, with 4 forward lean positions, the Speed Lock Lite ski-walk mechanism is strong and reliable on the downhill and fast on the transitions due to a single action Dyneema® cord that closes the cuff
• The BOA® Fit System delivers micro-adjustable, precision fit engineered to perform in the toughest conditions.
• Vibram® UFO Sole: Made with TOP85 compound that offers great durability and grip in cold conditions