NIKE Lady Free Run+ V3 Running Shoes Synthetic Rubber sole Dynamic Fit System - It tailors the shoe perfectly to your foot and provides a great fit. Nike Free Technology - This shoe delivers the feel of training barefoot with a natural fit and enhanced flexibility. Breathable Mesh Upper - A highly breathable upper also built with synthetic upper for greater durability. Strategically Placed Carbon Rubber - Under high-wear areas for durability. Reflective Details - For keeping you safe in low light conditions.