This is greatest boots selections store and most wanted model for shopping. We have free shipping for the Merrell Siren Ventilator Mid Olive Footwear: A mid height Siren that airs out while maintaining a strong show of support around your ankle. Full grain, synthetic leather and mesh uppers have flow-through breathability. Mesh is treated with Aegis Antimicrobial technology for a healthy foot environment. Quick-pull narrow gauge lacing ensures a personalized, proper, and secure fit. 4.5mm anatomically contoured footbed offers shock absorption to reduce foot/leg fatigue. Merrell Air Cushioning 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.