Nike ACG Mountain Fly Low GORE-TEX SE IB7328-003 College Gray/Cave Stone/Brown. The ACG Mountain Fly is reinforced with an expanded toe cap and durable rubber sidewalls to handle glacially sculpted rocks and root-strewn trails. Of course, you’ll get muddy, but that’s part of the fun. Durable traction inspired by rugged mountains keeps you balanced and ready for the adventure. Color shown: College Gray/Cave Stone/All Wood Brown/Malt. All my products are 100% Authentic. International Buyers – Please Note. We do not mark merchandise values below value or mark items as – gifts – The US and International government regulations prohibit such behavior.