Basically I crocheted both slippers and threw them in the washer on warm/hot for 15 minutes, and the wool compressed and got fuzzier and shrunk the slippers to size.
I got this pattern by Dawn Gillis on ravelry.com, while this pattern wasn't free, joining the site is, and you can access a lot of patterns for free. If you are at all interested in crochet/knitting, I would highly recommend joining.