It goes without saying that long adventure races bring on a lot of different terrain. The North Face designed the Ultra Cardiac Women's Trail Running Shoe to handle everything from loose sand to packed dirt to paved roads, so you can cover serious distance without worrying about losing traction. The secret is the full length Vibram outsole, which has deep lugs that grip equally well on uphills and downhills, along with the Pebax heel cradle and built up medial sidewall that help ensure a square foot strike and reduce the likelihood of rolling an ankle. The EVA cushioning is concentrated in the heel and toe, which is where you need it most, while the midfoot is more lightly cushioned to reduce weight and increase flexibility. The Ultra Cardiac's 8mm drop helps propel you forward, and the Ultra AirMesh and FlashDry upper move moisture away from your feet so you stay cool and collected while you put the miles behind you.