Headgear liners are described that may be inserted into headgear prior to storage to remove moisture, deodorize, control odor, prevent fungus, and discourage insects, rodents and other pests from entering or remaining inside the helmet. The headgear liner may comprise a central portion and a plurality of petals extending from the central portion so the headgear liner may conform to that interior cavity of the headgear. In some embodiments, the headgear liner comprises of a nonwoven material with at least one essential oil impregnated into the non-woven material, wherein the essential oil provides beneficial properties to the liner.
