The Siren sport is part of the Multi-Sport Siren Collection from Merrell. It is designed for women who need dynamic multi-functional footwear that maintains a high-style profile. Features include slip lasted construction. Full grain synthetic leather and breathable 4-way stretch 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 and Vibram Siren soleTC5 rubber.