Really one of the worst choices someone can make for beach shoes.
The fastening is the so-called scratch and it unfastens all the time by itself without any effort, and all the time at the beach I was taking them off to wash them since little pebbles kept getting inside, whether they were unfastened or fastened.
So simply, the moment you get out of the sea, they would open up in the sea, they would generally open all the time!
They don't fit well on the foot even though I got them 2 sizes smaller than my athletic shoes.
As long as they weren't wet, they were fine.
The only positive is that they are very affordable, but I tried them and they don't work for me, so I will go for something better and logically more expensive.
I suggest you go straight for something around 30 to 40 euros to have peace of mind.