Montrail Men's Fluidflex II Trail Running Shoe 100% Textile and Synthetic Imported Synthetic sole Lightweight and flexible trail running shoe with lace-up closure and three-point lugs for multi-directional traction Open mesh and seamless construction with medial overlays for support and protection Fluidfoam midsole with increased flexibility through deep flex grooves Midsole ride heights: 15 millimeter heel/11 millimeter forefoot