You are requesting the tariff classification on a product that is identified as an athletic mouth guard. The article is constructed of a flexible plastic material that will conform to the shape of the wearer’s mouth. The product is appropriate for use in a number of sports (hockey, baseball, football, etc.); it is not sport specific.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/K88348