I checked out the sizing chart, and ordered large accordingly.  I hadn't noticed that they were unisex, however, so they ended up being ridiculously huge, like clown shoes.  I returned them based on the size.  I also noticed that they were not particularly soft and comfy, like I would want my slippers to be; just a hard, thin leather sole and scratchy wool leggings.  My parents always wore acorn slippers, but they were much softer and seemed to be higher quality, as they still have the same pairs after 20 years or so of use.