Scarpa Alien Sky Trail Running Shoe

*scheduled to arrive at the shop on March 15, 2027. Please review our Pre-Order Policy. 

Scarpa Alien Sky Trail Running Shoe

Scarpa's most minimalist and technical trail runner, built specifically for vertical terrain and precision movement on extreme ground. The Alien Sky strips the stack down and wraps the foot in an integrated gaiter upper for athletes who need direct ground contact, agility, and protection on the most demanding mountain terrain.

Why We Carry It
This is the shoe for the runner who is already fast and wants a tool built specifically for vertical and technical objectives where every gram and every millimeter of stack height is a deliberate choice.

Highlights

• Low stack RACE platform at 6mm drop — A 26mm heel and 20mm toe stack keeps you close to the ground for precise foot placement and maximum agility on technical and vertical terrain. Significantly lower than the Alien Ultra for runners who prioritize ground feel over cushioning.
• SC-ATPU midsole — Scarpa's technical midsole compound that progressively absorbs impact while maintaining the responsiveness and stability needed during pace changes on variable mountain terrain.
• Vibram Megagrip outsole — Proven traction on rock, mud, and extreme slopes where grip is non-negotiable. The outsole system maintains direct ground contact for precision and stability across the full range of vertical terrain.
• TPEE Fabric and Eco Stretch Textile upper with integrated gaiter — Wraps the foot completely for a second-skin fit that protects against debris, scree, and the conditions that technical mountain terrain throws at you. The gaiter integration eliminates the gap between shoe and leg that standard trail runners leave exposed.
• RACE last — A performance-specific last built for the precise, locked-in fit that technical mountain running demands. Narrower and more aggressive than a standard trail running last.
• 235 gram half-pair weight — Exceptionally light for a shoe with integrated gaiter protection and Vibram Megagrip traction. One of the lightest technical mountain running shoes available.
• Non-dyed microfiber lining — Clean, low-impact lining material that stays comfortable against the foot on vertical efforts without chemical treatments.

Best for

Vertical runners, sky runners, and technical mountain athletes who operate on extreme terrain where precision, agility, and integrated foot protection matter more than cushioning. A purpose-built tool for athletes who know exactly what they need and are ready for a shoe built to match their ambitions.