HOKA Cielo X1 Unisex - Men's size 9.5 / Women's size 10.5 New, worn only once From HOKA descriptions: "A high-performance road racing shoe that's designed with speed in mind, providing a propulsive experience. Resilient two-layer, PEBA-based midsole is soft and lightweight with higher energy return Winged carbon-fiber plate sandwiched within the midsole creates a propulsive experience A 4 mm sockliner creates immediate step-in comfort Dynamic cutouts in the midsole help reduce overall weight An aggressive rocker shape encourages forward movement Breathable knit upper and collar with an asymmetrical gusseted tongue Minimal outsole rubber offers the necessary traction without additional weight Offset: 7 mm Weight: 9.3 oz"