Agree. The Mopar gray/fiat cover is really only good for indoor use - it does fit very well. Outdoors, it's ok for very short term use, but water will accumulate under it after it rains.I got the exterior one for 200$ (negociated with car purchase). Gray with Fiat logo. Not worth if you need good impermeability.
Replaced it Coverking Autobody Armor 500$cdn. Much better!