Merrell Omni-Fit lacing System provides a precise, glove-like fit Bellows tongue keeps debris out Molded TPU heel counter for added stability Vibram TC5+ outsole Hollowed lugs for lightness The fastest way to the top, this speed hiking shoe attacks terrain while allowing fluid, natural motion that responds to every contour for rapid agility. Its ventilated mesh upper is made for hot temperatures and forging creeks, moulding to your feet while keeping them cool and dry. Fuel efficiency comes from the energy-converting Unifly midsole that connects and protects over rough ground.