Provide proper ventilation

The Fresh Foam X Hierro v9 offers ultimate reliability for adventurous terrain, with technical features designed specifically for the trail runner. Dual-density cushioning combines plush comfort with a more stable underfoot feel. A Vibram outsole features a revamped tread pattern and deeper, 6mm lugs, for superior traction, and a knit upper with a gusseted tongue is breathable, while helping to protect against loose debris.

directional flex zones mimic natural gait biomechanics