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The Altra Olympus 4.0 retains its wide toe and zero toe drop heel in order to guarantee all trailers the most natural running experience possible remarkable cushioning and grip during their longest trail runs. Underfoot this shoe’s Vibram Megagrip outsole has been completely redesigned to provide better grip on a variety of trail surfaces and in all weather conditions. If your feet tire after running a good number of miles you’ll especially appreciate the superior cushioning of the Olympus 4. Covered with a tough breathable mesh upper this Olympus is our favorite to date. MIDSOLE Inner Flex grooves accentuate the flexibility of the shoe without adding weight for improved performance. FOOTSHAPE design more ergonomic in the metatarsal area for a more natural stride. Balanced cushioning keeps your heel and forefoot at the same height for minimal impact when running. A-Bound is an environmentally friendly compound made from recycled materials which provides effective protection under the foot. OUTSOLE Vibram MegaGrip sole made of a robust component providing exceptional grip on trail trails. STEM Technical mesh for improved resistance and breathability. Premium tongue for effective and personalized foot locking. 4-point gaiter attachment in the form of a hook to attach your gaiters in one click.