New Balance Fresh Foam X Hierro v9 Dark Alpine Green 2eSize & Fit Guide Delivering comfort and traction for the trails, Fresh Foam X Hierro v9 was crafted to inspire confidence and deliver performance wherever adventure takes you. Features Dual density Fresh Foam X midsole foam with approximately 3% bio based content delivers our most cushioned Fresh Foam experience for incredible comfort. The midsole has a softer top layer for comfort with a firmer bottom later for stability on uneven terrains. Vibram