Thank you for looking. This product is the DMC Super Fin XXL Blue. It is a fin from a top manufacturer loved by everyone from beginners to advanced swimmers for swim training. The size should be good for those around 28.5 cm. Since they are soft fins, your feet won't hurt even if you wear them directly. They can also be used for skin diving and bodyboarding. The price is usually around 10,000 yen, but since this is a sample product, I am offering it at a bargain price of 6,000 yen. Shipping will be via Kuroneko Yamato cash on delivery. Please note that this item is also sold at SHORES, located next to Sushiro in Tehiro, Kamakura City, so we apologize if it has already been sold.