Question about Mofu-Mofu Slippers

 Hey everyone. I just had a quick question about the slippers from the recent Mofu-Mofu line... what sort of soles do they have? As in rubber/harder sole, or just cloth material like many Pokemon slippers? I haven't been able to find this information anywhere I've looked online yet. I'm interested in them for practical use, but... currently live in a small house with 6 people and 3 cats, so if they're only a material sole I'm afraid I can't really justify buying them as they wouldn't hold up long here... ^^;;