Newton Running Women's Tri Racer Synthetic-and-mesh Ultra Light, Highly Breathable, Fast Drying Mesh - Allows air to flow near the foot, keeping you cool and comfortable. Seamless Anatomical Support Strapping - Provides comfortable support and a snug fit. TPU Toe Cap With More Generous Toebox - For greater stability. High Traction 5-Lug Midfoot Pattern - Anatomical lugs ensure greater efficiency and allow the foot to flex better. High Density Rubber In Heel And Toe - Provides durability.