Textile and Synthetic Imported Rubber sole Shaft measures approximately low-top" from arch For running on soft, muddy terrain and harder ground too. Perfect for fell, mountain, trail and x-country running as well as obstacle racing. Renowned grip: Iconic 8mm studs not only claw through soft terrain but also hold firm on harder ground. Go light, fast and natural: Weighing just 212g (may change) and boasting incredible flexibility, it complements the foot's natural movement and increases speed.