Nike ACG Mountain Fly 2 Low

Built for: City streets and hard-packed trails — the walk to the trailhead and the first few miles beyond it.

Nike ACG built the Mountain Fly 2 Low as an urban-to-trail hybrid rather than a technical hiking boot. A dual-density midsole pairs a firmer foam for support with a softer layer for comfort over long distances on foot, and a thick multi-directional lugged outsole gives it grip on gravel, dirt and wet concrete. The mesh upper is deliberately open for breathability, with a semi-gusseted tongue to keep debris out.

Why it works

• Dual-density midsole — firmer foam for support, softer foam above it for comfort on long days on your feet.
• 6.5 mm multi-directional lugged outsole in a hard-wearing rubber compound for grip on mixed surfaces.
• Breathable mesh upper with a semi-gusseted tongue on both sides.
• Removable insole, so you can drop in your own orthotic or footbed.

The details

• Surface: Pavement, gravel, hard-packed trail
• Best for: Walking, light hiking, everyday wear
• Drop: ~10 mm (35.5 mm heel / 25.6 mm forefoot, lab measured)
• Weight: ~15.2 oz / 431 g — substantial, built for durability rather than speed
• Not for: Running, or serious mountaineering

Colorway

An ACG execution with the outsole and midsole geometry left visible — the technical detailing is the design, in the way ACG has always done it.