The fully adjustable/detachable Chemical Flapp™ resists chemicals, acids, oils and solvents. Provides excellent protection to your ears and the back of your neck when spraying chemicals. Also works well while pressure washing. It is made of the same butyl rubber material as our other Chemical Spraywear Products. The Chemical Flapp™ quickly and easily fastens to all types of ball caps and hard hats. One size fits most.