NIOI-CLEAR Odor-Eliminating Helmet Inner All-direction stretch. Sweat-wicking and quick-drying for reduced stickiness, this is a must-have odor control item that effectively eliminates sweat odors. The deodorizing effect lasts semi-permanently with care involving only soaking in vinegar (acid restoration). Used as an inner cap for helmets and hats for sun protection. Color: Black