Gun cases often hold in moisture causing rust on your gun. The Benelli Gun Sock not only allows the gun to breath, but is also impregnated with Volatile Corrosion Inhibitor (VCI), a class of corrosion inhibiting compounds, which have sufficient vapor pressure to release molecules from the compound into the air. The VCI Inhibitor safely prevents corrosion on protected metals without the need for messy grease, oils, or protective coatings.