Design: Gaiter-style collar keeps out trail debris Matryx(R) quick-dry upper designed for lightweight, durable breathability Ghillie lace construction Dynamic vamp for foot splay Speed-centric MetaRocker(TM) for smoother heel-to-toe transitions In-Shoe Comfort: Carbon fiber plates with winglets designed to deliver a stable, propulsive ride Dual-layer PEBA midsole for lasting comfort and support Durability & Traction: Vibram(R) Megagrip Litebase outsole with Traction Lug built for grip, speed, and precision on the trail 4 mm lug depth Additional Details: Best for: Trail Running, Race Weight: 7.9 oz / 223 g (size 10) Stack Height: 39 mm heel / 34 mm forefoot Drop: 5 mm