Vivobarefoot Lady Neo Trail Hydro Phobic Mesh Running Shoes mesh 2.5 mm Base, 4.0 mm Lugg Height - This makes the shoe extremely shallow in height, meaning you are extremely close to the ground, giving amazing performance. 3.0 mm Press EVA Insole - helps to keep the shoe extremely low profile but also gives a tiny bit of cushioning with the EVA. Ultra thin Puncture resistant Sole - Very important when running over rugged terrain and sharp rocks. Because the sole is thin you need confirmation that the sole will last and be durable. Anatomic Toe Box - The shoe is shaped to allow the foot to behave as it would if bare - to expand and contract with every step exercising the feet keeping the feet in good conditions. Neutral Last - Zero drop heel and no pitch to give natural gait to your running style.