On the trail, details matter. Fast, rugged and ready for whatever wild comes your way, the updated ACG Mountain Fly 2 is here to take you to the top.

Over glacial-smoothed granite and root-twisted trails, we've reinforced every step with an extended toe cap and mountain-tough rubber sidewalls.

Don't worry about pushing your hardest either—the breathable upper helps keep you from overheating and lets you air out quickly when wet.

• For extra comfort and support, a foam midsole and lightweight plate runs from the ball of your foot to the heel.

• Crag-ready traction inspired by mountain bike tires is redesigned to help improve durability.

• Entry is easy with a semi-gusseted tongue, plus a lace toggle for quick adjustments on the go.