My feet are terrible on slippers. I'm lucky if they last 6 months. Doesn't help that I haven't been to a chiropodist in over a year now. I can't wear socks. I hate wearing them inside, whereas I can kick slippers off when I sit down.
All I want is a supported foot as I have PF (plantar fasciitis) and a nice lining to keep the tootsies warm. I have some lovely ones from Amazon atm but the sole lining has already started to wear out. https://smile.amazon.co.uk/gp/product/B076F45RSK/ref=ppxyoodtbbsearchasinn_title?ie=UTF8&psc=1
Got them in September 
The leather type mules last but not warm.
Budget is up to £60