The fabric was strangely weird. (Clean Dark version)

I purchased the 511 Clean Dark version of these jeans. The fit was exactly what I expected from the jeans, but the fabric was weird and sort of burlap-y. The color was an excellent dark color, but the legs are already fading and it's been like 1 week. I'm afraid to wash them ever because I'm sure it'll fade like crazy. Not a huge fan of the jeans. I'd just recommend going to a store and buying them there.