Montrail Womens Fluidflex II Lightweight Trail Running Shoe 100% Textile and Synthetic Imported Synthetic sole Open mesh and seamless construction Medial overlays for support Fluid foam midsole with increased flexibility through deep flex grooves Ride heights 15 millimeter heel and 11 millimeter forefoot Gryptonite heel and forefoot traction zones incorporate 3 point lug shapes for multidirectional traction