Thing 's a thong
https://teakdoor.com/attachment.php?a...tid=4863&stc=1
https://www.youtube.com/watch?v=Oai1V7kaFBk
I prefer toe-covered sporty sandals from my time on the big blue wobbly road.
https://teakdoor.com/attachment.php?a...tid=4864&stc=1
You'll have to ask someone else about watersports, though.