INOV-8 Road-X 255 Running Shoes mesh, synthetic Dynamic Fascia Band - Embedded between the midsole and outsole for maximum efficiency and power transfer with each stride. Sticky Rubber Outsole - Ensures you have fantastic grip and traction on all surfaces. 3 Arrow Shoc-Zone - Ideal for making the first step in transitioning between cushioned and minimalist shoes. Good cushioning with a lower than average differential. Synthetic Overlays - Provide additional support and an improved fit. Lightweight Mesh Upper - Provides lightweight comfort, support and breathability.