This Siren has control issuesin the best sense. Combining narrow gauge webbing and leather anchors, its full-length lacing system snugs the breathable mesh upper to the foot for an exceptionally precise, balance-enhancing fit. Women-specific Q-Form alignment in the Air Cushion midsole supports, directs and aligns foot for a more efficient gait. Siren sole combines lugs and tread for wide-range effectiveness. 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. Vibram Siren sole/sticky rubber. Available Colors: Marine Blue, Elephant/Pink, Grey/Periwinkle.