Here they are before I felted them. As you can see, they are a lot larger than my regular shoes. They would probably fit Ronald McDonald, though.
Here's a close-up of one of the prefelted slippers.
Below, the slippers have been put in a pillowcase and are being agitated in a washing machine.
Every 5-10 minutes, the washer was stopped and the slippers were examined to see how they were coming along.
The post-felted slippers are a much more reasonable size.
Revel in the felted slipper's fuzzy denseness!
The yarn I used was 'Naturally Tussock Aran 10 Ply', which is 55% [correction: 85%] New Zealand wool and 15% 'polyester effect yarn'.