Yarn-Bulky weight Red Heart "Misty". I used whatever was left of the ball I used to make my stripy toque (AKA my jaunty new chapeau) plus another 4 oz ball.
Cast on 24 (EDIT: Sorry...mine has 36) stitches, or however wide you want it (multiple of six)
Knit 3, purl 3 all the way across the row. Repeat until it's as long as you want.
Final dimensions-mine wound up being about five and a half feet long and about six inches wide. And wow, is it ever soft and comfy!!!