Hairnets of any material — nylon, silk, cotton, or other fiber — classify under heading 6505 regardless of the fiber used. The heading text explicitly includes hairnets of any material, so the fiber content does not redirect classification to a textile chapter, though it may affect the duty rate at the tariff-line level.

Heading 6505 is limited to headgear made from fabric in the piece (knitted, crocheted, felt, lace, or other textile fabric cut and sewn) and hairnets. Heading 6506 is the residual 'not elsewhere specified' heading covering headgear of other constructions or materials — including rubber, plastics, furskin, and safety or sports helmets — that do not fit the specific construction criteria of 6505 or the other headgear headings.