I bought a size small as I'm a 5, but these are far too big and very uncomfortable squished into anything but big wellies! Also, for the price, the charger "pockets" should be deeper and they should have either velcro or a button to prevent the chargers being pushed out.
The area where the toes go scumples up and is very uncomfortable but that could be because they're ridiculously large!
They heat up nicely but don't get very warm, that's fine for me as a dog trainer standing in a cold field all day, but probably not great for folk in colder climates.
I definitely don't feel they are value for money unfortunately.