Warning: I'm about to bitch and whine a lot.
It's my perennial complaint: Why can't anyone make house slippers right? We have a choice between slippers that completely cover the foot and have more insulation than most snow boots or little ballet slipper things and other styles that are the right weight and thickness of material but don't cover the entire foot.
In addition to this, sizing is a big problem. You rarely find slippers that come in all the sizes. I wear a size 8 not a size 8-9. There is no such size as 8-9. In order to fit both size 8 and 9 it has to be a size 9, which means it's too big for a size 8 foot. Which means, they don't make slippers in my size.
So what about slipper socks? This is what I would really like - barefoot feeling but warm and non-skid. But here we have similar problems. There are lots of slipper socks or "lounge socks," some that are just socks, some with anti-skid dots. Some of these fit well but many are loose and saggy. Most of them are not really warm enough for cold floors. And the ones that are aloe infused? These usually fit very well but they shed worse than a pair of Persian cats in the summertime until you have washed them half a dozen times.
On the other hand, you have the famed Acorn slipper socks - nice thick wool socks with a leather slipper sole with a thick layer of foam padding. They're nice and a lot of people love them but they don't really work for me. I did have a pair years ago. The thick, padded sole is more than I want. I want something more like the sole on kids' footie pajamas. There's also the same sizing problem mentioned above. They don't come in exact sizing and with the kind of sole they have they really need to. Not to mention that they are ridiculously expensive.
Finally, there are the "muk-luk" socks. I got a pair of these last year. They have exactly the right kind of sole and the sock is a nice thickness but way too loose. The sole on them is a little short for me but it's about a whole inch too wide.
The only solution is to make my own and I am working on it. Which, at this point, means mostly just thinking about it. The problem is finding the right material. I did find a couple of different non-skid sole materials; I'm talking about the tops. I made a polar fleece pair and that didn't work well. It's not stretchy enough. It also makes my feet sweat and then cold. I suppose I just need to learn to knit or crochet.
So... the quest continues.