Car covers come in different materials. Plastic covers were a popular choice a few decades back. Although these covers are waterproof, they are unpopular for trapping condensation underneath the cover. Breathable covers feature different fabrics like Tyvek, which is water-resistant. You can also opt for a blend of polyester and cotton, which are available in flannel and cloth styles. The combination does not make rainproof covers. You will want to avoid long-term outdoor usage with car covers made using these two materials.