This is the Mopar cover I have. I've been using it outdoors in Florida with no ill effects to the cover or car:

Part # 82207934 Each $272.00
Vehicle Cover - Gray
For Coupes. Crossfire logo. Features license plate window and storage bag. Vehicle Cover helps protect your vehicle's finish from UV rays, dirt and other airborn pollutants. Made of Premium WeathershieldŽ material that is washable, heavy weight, breathable and water resistant. Custom contoured, this cover features double-stitched seams and elasticized bottom edges at the front and rear.