From Merrell, the Women's Siren Edge 3 Trail Runners feature: Mesh and 3D-printed TPU upper Lace-up closure Kinetic Fit™ TRI removable contoured insole provides light support to all three arches of the foot Molded nylon arch shank Women's-specific Q FORM® dual-density midsole provides light pronation relief Vibram® TC5+ outsole 3.5 mm lug depth Approx. 1 lb, 2 oz. weight Imported.