I bought it in the summer from a local store. I wear size 45, so because it is a slipper and I wanted it to be more comfortable, I got size 46 and it is perfect. Comfortable without causing any problems with the larger size.
For me, it has 2 characteristics that make it absolute value for money.
1. It doesn't slip at all. I wear it in the shower with tiles and it doesn't move at all.
2. It is very lightweight.

Apart from that, the foot sits nicely inside, it is very easy to put on, and only when I wear it with socks does it require a little more effort to take off. Of course, the foot inside the slipper does not slip whether with socks or without.
I highly recommend it for 10-15€.

Good evening, after studying the size of my foot, unfortunately I have to say that if you wear, for example, a size 46, you should get 1 - 1.5 sizes larger, because apart from the fact that they have a narrow fit, they are not easy to wear. It is difficult to put on and take off. They are relatively comfortable to walk in, of course not the expected "wow", you feel them light, but I wouldn't dare to walk in water as I believe they will make you slip. Their durability will show over time. Basically, we don't all have the same feet, so everyone should do what works for them. I hope I helped.