Nike ACG Ultrafly Trail Racing Shoes - Spruce Fog/Black Spruce

The Nike ACG Ultrafly Trail Racing Shoes – Spruce Fog/Black Spruce are built for runners who want elite speed, lightweight cushioning, and confident control across long-distance trail efforts. Designed for fast movement over rugged terrain, the Ultrafly combines responsive ZoomX foam, a refined full-length carbon fiber plate, and Vibram® Megagrip traction to deliver a race-ready blend of propulsion, cushioning, and stability.

At the core of the Ultrafly is ZoomX foam, Nike's lightweight and highly responsive cushioning platform. Engineered to deliver strong energy return while maintaining a stable feel on uneven terrain, the midsole helps support efficient transitions through technical trail sections. An unwrapped heel design further enhances responsiveness and promotes a smoother ride from landing through toe-off.

Finished in Spruce Fog/Black Spruce, this ACG trail racer balances technical performance with a versatile outdoor-inspired look. From long-distance trail races to fast efforts over rocky, wet, and uneven ground, the Ultrafly is designed to help you maintain speed without sacrificing confidence underfoot.

ZoomX Foam for Responsive Trail Cushioning

Nike's ZoomX foam provides lightweight cushioning with high energy return, helping create a fast and responsive feel over extended distances.

The foam is tuned to deliver cushioning without excessive bulk, giving trail runners a combination of softness, responsiveness, and support for long efforts over changing terrain.

An unwrapped heel design allows the foam to work more freely, enhancing responsiveness and helping create smoother transitions when navigating technical sections.

Full-Length Carbon Fiber Plate

A full-length carbon fiber plate adds propulsion and efficiency to the Ultrafly's trail-focused platform.

The plate is designed with a softer, more flexible feel than more rigid racing constructions, allowing it to better adapt to uneven terrain while still providing forward momentum.

This balance of propulsion and flexibility helps runners maintain speed while preserving a more controlled and natural feel on the trail.

Vibram® Megagrip Traction

Underfoot, a Vibram® Megagrip outsole delivers dependable traction and durability across demanding trail surfaces.

The outsole is designed to provide confident grip on wet, rocky, loose, and technical terrain, helping runners maintain control during climbs, descents, and quick transitions.

Its performance-focused construction also helps reduce unnecessary weight while preserving the durability needed for long-distance trail racing.

Lightweight Mesh Upper

The Ultrafly features a lightweight mesh upper engineered for breathability, durability, and water drainage.

This construction helps keep air moving around the foot during demanding efforts while allowing water to drain more efficiently in wet conditions, stream crossings, or unpredictable weather.

The upper provides the structure needed for long-distance performance without adding unnecessary bulk.

Built for Long-Distance Trail Racing

With an approximate weight of 287 g (10.1 oz) and an 8.5 mm heel-to-toe drop, the ACG Ultrafly is designed to balance cushioning, propulsion, and control.

Its combination of responsive foam, flexible carbon propulsion, durable traction, and breathable construction makes it well suited for runners tackling technical miles, trail races, and long-distance off-road efforts.

Key Features

• ZoomX Foam Midsole: Lightweight, responsive cushioning designed for strong energy return.

• Unwrapped Heel Design: Enhances responsiveness and promotes smoother transitions.

• Full-Length Carbon Fiber Plate: Adds propulsion while maintaining flexibility for trail control.

• Trail Racing Performance: Engineered for speed and efficiency over rugged terrain.

• Vibram® Megagrip Outsole: Provides dependable traction on wet, rocky, loose, and technical surfaces.

• Lightweight Mesh Upper: Promotes breathability while supporting durability and water drainage.

• Long-Distance Cushioning: Designed to maintain comfort and responsiveness over extended trail efforts.

• Flexible Propulsion: Carbon plate construction balances forward momentum with terrain adaptability.

• Lightweight Construction: Approximately 287 g (10.1 oz).

• 8.5 mm Heel-to-Toe Drop: Provides a balanced platform for trail racing and long-distance running.

• Trail-Ready Stability: Designed to maintain control across uneven and changing terrain.

• Spruce Fog/Black Spruce Colorway: Versatile outdoor-inspired styling with a technical trail aesthetic.

Best For

• Trail racing

• Long-distance trail running

• Technical terrain

• Rocky trails

• Wet trail conditions

• Loose surfaces

• Fast trail efforts

• Racing and competition

• Responsive cushioning

• Carbon-plated propulsion

• Lightweight trail performance

• Runners seeking premium traction

• Climbs and descents

• Extended off-road mileage

Specifications

• Category: Trail Racing Shoes

• Brand: Nike

• Collection: ACG

• Model: Ultrafly Trail

• Midsole: ZoomX Foam

• Heel Construction: Unwrapped ZoomX Heel

• Plate: Full-Length Carbon Fiber

• Plate Design: Flexible Trail-Oriented Construction

• Upper: Lightweight Breathable Mesh

• Water Management: Designed for Water Drainage

• Outsole: Vibram® Megagrip

• Traction: Wet, Rocky, Loose & Technical Terrain

• Approximate Weight: 287 g / 10.1 oz

• Heel-to-Toe Drop: 8.5 mm

• Primary Use: Trail Racing & Long-Distance Trail Running

• Color: Spruce Fog/Black Spruce