I'm intrigued as to what concrete grippers are now.
These are not something I would buy, but if they seem practical for how you would wear them, then go for them.
There are so many posts here about how awful they are, but I also think a lot of suggestions posted are no nicer.
And then fishermen sandals. So by going for those, you will just appear a clone of everyone else as looking through any other sandal thread......Moshulu fishermans sandals ad nauseum.
I wear sandals most of the year as live in a hot country. I can assure you that half of these posted here won't get worn that much, have to be styled just so. And my heel bone is cringing looking at those leather sandals which imo are going to take a season to break in.
Sandal threads are quite interesting to read as an 'outsider' to current Northern Hemisphere fashion. One OP will post the most unflattering shoe and everyone loves them. Another OP can post an almost identical shoe on another thread, and like you, get such negative replies.
So what everyone else seems to think, seems to depends on the first reply.
I only comment on these is to check this colour is one that would work. I am very pale and if I wear a light shoe like this, I look like I have no feet from a distance. Skin tone does matter in sandals.