How are the Niu Tou Pai (Ox Head Brand) slippers?

As the news reported, they're all sold out. The Taichung store, in particular, had a lot of people queuing up. The owner said it's been raining heavily in the south, making it difficult to restock. Are the slippers really comfortable? They say it's helpful for plantar fasciitis, I have plantar fasciitis and want to give them a try (◡ ω ◡)