Alien 5.0

The Alien 5.0 is SCARPA's ultimate competition ski mountaineering boot, co-developed with the world's top skimo athletes and built without compromise. A full carbon shell and carbon cuff deliver an unmatched stiffness-to-weight ratio, tipping the scales at just 610g per half pair while maintaining the torsional precision that podium finishes demand. The Intuition® Race 4.0 SL liner wraps the foot in a race-tuned, anatomical fit that eliminates dead space and maximizes energy transfer from first skin to final descent. The Speedlock Lite walk mode and 5mm Optimized Touring Pivot keep transitions fast and efficient, while the BOA® Fit System + cord closure delivers glove-friendly micro-adjustment at race pace. Now available in Carbon Silver, because at this level, performance and presence go hand in hand.   Full Carbon Shell + Carbon Cuff — All-carbon construction at 610g per half pair delivers the ultimate stiffness-to-weight ratio, so every watt of power goes directly into your skis Intuition® Race 4.0 SL Liner — Competition-grade heat-moldable liner provides a precision anatomical fit that eliminates pressure points and maximizes energy transfer across full race days Vibram® UFO 4.0 Outsole — Next-generation race outsole delivers reliable grip on technical approach terrain while keeping weight to an absolute minimum BOA® Fit System + Cord Closure — Tool-free micro-adjustable closure locks the foot with race-level precision, even with gloved hands at altitude Speedlock Lite + 5mm Optimized Touring Pivot — Ultra-compact walk mechanism with 9°–15° adjustable forward lean and a tighter 5mm pivot for faster, more efficient transitions on race courses