The Nike ACG Mountain Fly GTX â€˜Blackâ€™ is built to handle rugged terrain and inclement weather. A toggle lacing system secures the upper, crafted from lightweight black textile lined in waterproof Gore-Tex. The matte silver Swoosh, grid-patterned overlay and ACG-branded heel are all treated to a reflective finish. A flexible ankle cuff keeps out debris, while dual pull tabs enable easy on and off. Lightweight cushioning arrives via a React midsole and a full-length carbon fiber plate. Underfoot, a lugged rubber outsole provides durable traction on rough, uneven surfaces.