Uneven terrain, rock gardens and humidity are unique challenges for shoes that require technical construction. For those who like to think outside the box, the Fresh Foam Hierro is: a shoe that takes the best of off-trail technology. The Fresh Foam X Hierro v7 uses a Vibram® Megagrip outsole to create a protective envelope of durability and grip around Fresh Foam X cushioning and a lightweight, breathable upper.