The Combined Nomenclature (CN), v1:2018
6506 91 00: Bathing caps, hoods and other headgear, whether or not lined or trimmed, of rubber or plastics (other than safety headgear and headgear having the character of toys or festive articles)
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=bdccfab4-a71c-4f32-8b96-d3d9ed56013c