OUTside

I don't have a lot of outdoor furniture, so I'm not sure I understand the concept of patio furniture covers. Are these covers somehow made to be waterproof, or are they intended for the not-really-outside-but-it-has-a-lot-of-windows-so-I-can-pretend-I'm-outside-kind-of-room? If that is the case then I suggest calling it Florida room furniture. Not much chance of rain in rooms like that. Unless it's like our old house and the Florida room roof is so rotted that the rain literally poured through the ceiling. We didn't put any furniture out there....