Vivobarefoot Men's Evo II Running Shoe 100% Fabric Synthetic sole 4.0 mm Sole - 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 - Provide maximum proprioception and protection to your feet. 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.