Teamoy Swim Diaper 2-Piece Set, Adjustable Size with Buttons for Babies 0-3 Years Old, Waterproof Outer Layer, Polyester Mesh Inner Layer, Diaper Cover for Swimming Lessons, Parks, Beaches, and Pools (Animal World + Polar Bear) Purchased on Amazon for 2,050 yen. Used once each. Cleaned. Size is listed as 80, but adjustable, so it can be used until around 3 years old.