I have 2 Evolution 4 covers. One for the Ram Quad and one for the Magnum SRT. (it is the same material as the factory Mopar covers)
You can get the this material from several cover manufacturers - I think my brand is WOLF.
Both mine fit very well material is thick for a cover so it is classified as an indoor/outdoor cover. However it is not thick enouch to cushion a heavy impact, but I do not expect a cover to be able to do that. It is far more than an interior dust cover. overall a reasonable material for the price.
They are fairly bulky for storage - but the current ones I have are LARGE.