Nature enthusiasts love the idea of outdoor adventure, but the natural landscape is about more than just fresh air and views. Uneven terrain, debris and moisture present unique challenges for footwear, requiring specialized construction. For those who love to go off the beaten path, the Fresh Foam X Hierro is an off-road application of our best running technology. The Fresh Foam X Hierro v8 uses a Vibram® outsole to create a protective shell of durability and traction around signature Fresh Foam X cushioning and a lightweight, breathable upper.