After purchasing a pair of mens for myself, my mom had to have these. The slippers have memory foam insoles, and a lot of lining in them to keep your feet warm and cozy during the winter. I found that both pairs don't make out feet sweat, but keeps them warm enough where no heat gets out of the slipper. The first time you wear them, some of the loose lining may come up, but once they are broken in, this goes away. They are the most comfortable brand of slipper we have ever owned. I would recommend ordering the closest size up if your unsure. They are tight and snug on your feet, but not too tight where your feet are strangled and constricted. My shoe size was a 12/13 so I ordered a 13 in mens and it fits perfectly snug. My mom was a 8/9, and the 9 is perfect on her foot. Any size less would have been too tight. If your between sizes, I recommend going to the upper.

Overall, warmest slipper I have ever had, most comfortable, and this one is well worth < $20 on Amazon with prime. Stores sell similar shoes for $30 or more.