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The Siren Sport by Merrell responds to the urge to surge. But with a full grain leather upper and rubber bumpers at toe and heel it is built for durability. Merrell Air Cushion® midsole with women-specific Q-Form™ technology smoothes out strides while maintaining alignment. Vibram® Siren™ sole features heavier lug pattern in high-friction areas and tread for vital traction under the arch. End Uses: Light hiking or biking on trails or urban terrain in dry conditions. Best worn with mid to light weight socks. – Slip Lasted Construction – Full Grain/Synthetic Leather and Breathable Mesh Upper – Breathable Mesh Lining – 4.5mm Anatomical Footbed – Nylon 6.6 Injection Molded Arch Shank – Q-Form™ Triple Density Compression Molded EVA Footframe – Air Cushion® Midsole – 5mm Sole Lug Depth – Vibram® Siren™ Sole/TC5+ Rubber Women’s Sizes: 5-11 Weight: 1 lb.