It's for either. More than a dust cover, but not the best out there. It kept my car dry as the rain sort of beaded up ON the cover and did not soak through. UV protection as well. When the rain stopped and the sun came out, the cover dried quickly. Served my purposes well.

You can look it up on California Car Cover Company - Find a Cover. Put in the year, model, etc. When you car comes up, scroll down to bottom. You'll see Multiweave II. That's what I bought...Outdoor; dust and UV. But it did keep my car dry in normal rain.

Hope tis helps!