Purchased at DMM Kariyushi Aquarium in Okinawa. 95% polyester 5% polyurethane Smooth to the touch. The waist measures 23cm when laid flat, so I think these are for children sized 100cm to 110cm. Two-piece set: penguin pattern and sea slug pattern. Retail price was 700 yen each. Although it said "free size," I was skeptical when I bought them. However, when I compared them to my child's underwear (130cm) at home, I realized they were too small... I didn't even need to try them on ( ；∀；) They are new and unused, but because the size is ambiguous (free size), I'm selling them at a lower price.