The Gunsoc impregnated with VCI is a patented product designed to combat corrosion. Oxygen, moisture and condensation in the air can quickly corrode a gun. VCI Gunsoc establishes an invisible barrier around your gun which virtually eliminates any chance for water or oxygen to react with the metal. VCI penetrates deep into the tiniest cracks and crevices that oils can't reach to neutralize the effects of water and oxygen. The VCI Gunsoc slowly releases compounds within a sealed airspace to create an invisible barrier a few molecules thick that actively prevent surface corrosion.
My wife bought me one of these and it works great; first I don't get to hunt often and I never have a problem with rust or corrosion when I get the chance, and second I really like it because it is very stretchy and fits over the scope with ease.