At first touch you'll notice that it's very thin. Holding it up you can see right through it. It's not thin enough to watch television through, but thin enough to see recognizable things and light. Don't let that stop you from buying these. They're very warm! I'm 6 foot 2 inches tall and it's a decent size for me, although it doesn't fully cover me. If I curl up both my Girlfriend and I can keep pretty covered at the same time.
I wouldn't go playing tug of war with my dog, but if you just want something warm to keep on the couch, this is perfect.