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Zappos.com is proud to offer the Merrell - Siren Sport (Charcoal/Pink) - Footwear: Specifically designed to provide women with dynamic, multi-functional and stylish footwear. ; Full grain synthetic leather uppers feature rubber bumpers at toe and heel for durability. ; 4-way breathable mesh is treated with Aegis Antimicrobial technology for a healthy foot environment. ; 4.5mm anatomical footbed provides shock absorption to reduce foot/leg fatigue. ; Merrell Air Cushion midsole features Q-Form technology to smooth out strides and maintain alignment. ; Nylon 6.6 injection molded shank offers superior arch support and is airport friendly too. ; Vibram Siren TC5+ rubber outsole with a heavy lug pattern in high-friction areas and enhanced tread for vital traction. ; Slip lasted construction. ; 10.00 oz. ; Product measurements were taken using size 7.5. Please note that measurements may vary by size.