Shag throe is the largest. We love it for lots of things. It's very warm. I've fallen asleep under it, and woken up all covered in sweat. (Now, isn't that sexy?) It's a bit larger than the other ones, and the shag side is really soft.
They all have a wet proof middle, so they are a little... crinkly. But, they do a good job from everything to protecting the bed during sex, to use as a blankie, to just covering a chair to make you comfortable. I like to use our Shag throe in the winter to cover my legs, when sitting, watching TV, reading or hanging out on the computer.
I did find yesterday evening that when it's hot out (it was 80 degrees in our bedroom last night) the satin side is hot when your body is touching it. But, I'll flip it as soon as I can.