I actually would have returned this item if there had been a return label or instructions enclosed.  The weave of the blanket had gaps that made it look like there were holes in it, and there are a couple yarns of different colors woven into it.  I went ahead and washed it and after it came out of the dryer (there was a huge amount of lint from it in the dryer lint trap) the fibers shrank enough that the gaps tightened up.