The Inov-8 Women's Trailroc 280 With Graphene Grip Handles Hard And Rocky Trails With Ease. Featuring a graphene-enhanced rubber outsole, the Trailroc delivers the world's toughest grip over hard and rocky terrain. With increased protection both underfoot and around the toes, as well as added comfort and cushioning, this shoe offers the ultimate package for those running all distances over technical hard-packed trails.