The Merrell Women's Siren Sport Gore-Tex XCR Shoe is designed for excellence in outdoor terrain. The Gore-Tex XCR membrane gives optimal water proof capabilities when you're trudging through a wet trail, while the extremely breathable mesh back lets moisture escape as well. The shoes narrow guage webbing with synthetic leather strapping provide a supportive fit needed for the unexpected twist and turns of your run and also amplifies the speed lacing for a snug fit. The Vibram Siren sole's TC5 rubber combines traction and traction for optimal performance. With Q-Form Triple Density Compression Molded EVA Footframe the shoe molds right to your foot for increased comfort. The Air Cushion Midsole are designed for all terrain activities specifically for a woman and her stride.