Are your covers waterproof?
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You do not want a cover made from waterproof material like a plastic tarp. Waterproof materials do not breathe and will trap moisture and condensation underneath the surface of the cover, which will cause damage to the glass, fabric (like Ceconite), paint, and/or composite.
Our covers are treated to reflect the harmful UV sunlight and are highly water repellent. Our covers are water repellent enough to stop any leaks in the canopy and door seals yet are breathable. This means that condensation is allowed to breathe through the cover or wick away off of the surface of the plane. After a heavy rain, you may feel some slight dampness on the underside of the cover. But, this moisture will not be trapped under the cover. Instead, it will breathe out and dry quickly.
On this picture below taken at Oshkosh EAA Airventure in 2009, note how the water pills up on the surface of the material on this Cessna 195 Canopy Cover: