If they weren't so expensive, I wouldn't even bother commenting on them, but they are really unacceptable. I was fooled by the reviews and ordered 2 sets and unfortunately they disappointed me a lot. The first pair got holes in a month and another 2 in the next 3 months.
They are indeed comfortable, both in terms of fit and breathability.
At first, they seemed quite strange as my foot slipped inside the shoe, but either I got used to it or it improved after some use.
They definitely don't withstand wear and tear and are not suitable for someone who walks a lot or uses them instead of slippers, like me.