Vibram FiveFingers Seeya Running Shoes Polyurethane Insole - Stitched-in to ensure protection of the skin and foot tissue through out longer runs. Soft TPU Midsole - Further reducing weight and thickness for increased flexibility. Breathable Mesh Upper - Ensuring air flow around your foot, to provide a cool, comfortable, dry ride. Seamless Collar - Reducing irritation, and providing protection against external debris. Hook-and-Loop Closure - Ensuring the naturally breathable upper has a secure fit.