We do a lot of surf entries around here.
I've used one of these for years on my entries and exits on shore dives, and never lost a fin.
My buddies see it and want one too.
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Clip it to a ring on your BC or harness (I prefer my left side).
Thread the open end of the webbing through your fin snaps and snap it closed.
One strap can easily hold two fins.
When people get knocked down in the surf their first instinct is to reach out with their open hand to stop the fall...
and goodbye fins.
No strap? At the very least they should loop the fin straps around their wrists.
K.