Thank you for viewing. These are NIKE's Zoom Double Stacked. They are women's size 28.5cm, which is equivalent to men's size 27.5cm. They feature a unique design with two Air pods in the midsole and two in the heel, the same as those found in NIKE's flagship running shoe, the Alphafly. They have been used multiple times since purchase. There is no air leakage or hydrolysis, but the heel area is slightly worn. I am open to reasonable price reductions. [Product Overview] Product Name: Nike Zoom Double Stacked Product Number: CZ8831-010 Size: Women's 28.5cm Color: Black Please feel free to comment if you have any questions.