I ordered the Tanjiro sandals from this set to wear with my cosplay, and I couldn't be happier with the product! Not only do they look great, they don't hurt your feet at all (and I wore them all day long!) They even come with the socks, which was a nice surprise because I was totally going to order them myself.
Another thing to note is they come with plastic straps, but I didn't use them at all. Not sure if they're to keep them from falling off your feet, but if you want them, they're there in the package.
For reference, I ordered size 39 and I wear a US women's 7. They fit perfectly!
I would recommend these to any Demon Slayer cosplayer.