The Inov-8 Lady F-Lite 215 features the F-Lite Outsole. A sticky rubber compound outsole which is designed to maximise running efficiency. The 215 features 2 Arrow Shoc-Zone which raises the differential from heel to forefoot, gifting you extra cushioning and support. A 6mm differential is ideal for the runner looking for that barefoot experience without compromising too much on support and cushioning. The upper construction features Synthetic, TPU and Mesh Upper which enhances the fit and offers superb comfort. The TPU and synthetic upper cradles around your foot for a stable and customised fit. It also adds great shoe strength, supporting the upper to help you keep going mile after mile.