These covers are very soft.  I purchased the dark grey.  One for our couch, one for our love sear. They stay in place thanks to the little rubber grippies on the back.  I was surprised because they didn't even move when our 60 lb. Dog got up on the couch! These are so much better than the T shaped ones we had. 
I was always tucking them in, and fixing the arms.  I washed before using, no fabric softener or dryer sheets, dried on very low.  They came out great!!! No, they were not super heavy in the washer.  That was a concern for us. And they dried quickly!! I think I'll be back for another color!!