Reebok Women's Premier ZigFly Running Shoe 100% Synthetic and mesh Synthetic sole ZigTech, one-of-a-kind zig-zag-shaped sole, absorbs the impact of heel strike and propels Synthetic/mesh upper ensures comfort, fit and durability. DMX Shear cushioning panels for added comfort and reduced heel stress; forefoot flex groov PU sockliner for added cushioning and support.