1. Monofin swimming device
2. Monofin
A monofin swimming device as depicted in the reproductions; the depicted monofin swimming device can be attached to a user's feet to help propel the user through the water while swimming.; 2. A monofin as depicted in the reproductions; the depicted monofin can be used as an insert to a swimming device, which then can be attached to a user's feet to help propel the user through the water while swimming.