Predecessor: Fresh Foam Hierro v6. For those who take going off the beaten path literally, there's the Fresh Foam X Hierro, a dedicated, off-road application of our best running technology. The Fresh Foam X Hierro v7 employs a Vibram Megagrip outsole to create a protective shell of durability and traction around the signature Fresh Foam X cushioning and a breathable, lightweight upper. Textile and synthetic upper. Lace-up closure. Round toe silhouette. Textile lining. Removable textile insole. Synthetic outsole