The Olympus 5 is Altra's plushest trail runner, with the grip and comfort you need for all-day adventure. Signature footshape allows feet to sit in natural position Vibram Megagrip provides ultra grip on wet and dry surfaces Offers optimal ground adaptability Innerflex grooves on midsole offer flexibility and movement Balanced cushioning encourages better alignment and form Trailclaw canted lugs provide added traction Upper: Mesh Midsole: Compression Molded EVA Outsole: Vibram Megagrip Cushioning: Max