Mountain-ready, these Altra trail-running shoes are made for your on- and off-trail adventures. They've been updated to be lighter weight and more durable. Built-in scree sleeves keep out debris. Built on the Olympus 6 frame with mountain-ready updates for off-trail performance, durability and comfort Matryx® uppers designed for high performance and durability Built-in scree sleeves for protection from debris Lighter weight than the previous model but with the same Olympus 6 midsoles and outsoles TPEE sockliners for added underfoot longevity FootShape™ toe boxes Original FootShape fit Balanced cushioning 275 refers to the temperature of the toaster oven that helped build the first Altras Weight (half pair): 12 oz. Best Use Trail Running Trail-Running Shoe Type Rugged-Trail Running Shoe Cushioning Maximum Cushion Heel-to-Toe Drop (mm) 0 Heel Stack Height (mm) 33 Forefoot Stack Height (mm) 33 Footwear Height Ankle Footwear Closure Lace-up Upper Matryx Lining TPEE sockliner Midsole Compression-molded EVA Outsole Vibram Megagrip Rock Plate No Weight (Pair) 1 lb. 8 oz. Gender Men's