The (2)Silicone Cartridge Dust covers are meant to be used as a condom lol, almost. The intended use is for when you pull out the two plugs at the mouth piece to protect the cartridge from getting lint and etc in your pocket in the
device. The added benefits to pulling out the plugs are said to give you more TH, a more consistent Vapor and Flavor. The only aspect I
have experienced so far to using the dust cover is a more consistent Vapor, IMO, but others may disagree with me.