From Knitty, Winter 2004 issue:

“This pattern really only takes about 50 yards of yarn (the rough calculation) and so it can be made with any scraps of worsted weight yarn left lying around. For the fleece, I used one bat from a needle felting set. When I tried to weigh it, it didn’t even register on the kitchen scale, so I’ve included a photo of the fleece on top of a CD case for reference.”