Columbia Women's Ravenous Trail Running Shoe 100% Synthetic and mesh Rubber sole 3D Techlite in the heel stabilizes your foot for reliable support Durable, non-marking Omni-Grip rubber outsole offers great all-weather traction Open Cell PU footbed contours to your foot for superior comfort Techlite midsole absorbs shock and takes the abuse out of your run Lightweight synthetic upper for a comfy, nimble feel