Overall, these slippers seem very sturdy, they have a good plastic sole and the foot does not get cold.
They are comfortable to some extent in the sense that they are stable like shoes and the foot adapts more to the slipper than the opposite (as is the case with cheap slippers). The size is normal.
The downside is that the insole has a material inside that easily and strongly smells, like glue. I have now put shoe inserts inside to solve this.