Women's Hoka Challenger 8Hoka Challenger 8 Women's Trail Running Shoes Built at the intersection of road and trail, the Challenger 8 delivers all the smooth cushioning and confidence inspiring traction you'll need to tackle a variety of terrain. Durable Rubber Outsole The outsole is made from highly durable rubber for great grip and traction you can rely on. It forms a solid bond with the ground beneath and resists damage, so you can fly across varied terrain with confidence.