Merrell Allout Fuse Women's Trail Shoes UniFly Midsole - Disperses impact and stabilizes for a solid takeoff. Multi-Directional Traction - Working together with UniFly gives you connection, firm takeoffs and soft landings over rocks, scree and anything in between. Omni-Fit Lacing System - Provides a precise, glove-like fit. Breathable Mesh Lining - Ensures your feet stay cool and comfortable. M Select Fresh - Odour control, ensures your feet stay fresh and odour free.