We bought quite an expensive rattan corner sofa casual dining set with water resistant cushions this year just not sure what to do with cushions when the weather turns? Never had furniture like this before. We've been storing them in one of those large plastic box things with doors at the front and a hinged lid when it rains but can we leave them in it all winter? Don't want to get them out next spring to find them ruined!We don't really have space for them inside. There's loads of them! The rattan itself is fine to be left outside. The manufacturer makes a cover but says it's not intended for winter.