For use with the 3M™ RBE Powered Air Purifying Respirator (PAPR) Assemlies RBE-NMV, RBE-LV, RBE-NMB, RBE-LB, RBE-L10N and RBE-NM10. Helps protect the 3M™ RBE PAPR Assemblies RBE 40 and RBE 57 from moisture, but does not eliminate moisture entry completely. For use by first responders, law enforcement, military and health care professionals.