Porta-Bote's
Polypropylene hull is almost 1/4 inches thick... twice as thick
as an aluminum hull. And, Unlike the thin skin of an inflatable
(every inflatable comes with a patch kit!) even the sharpest
rocks would have a hard time piercing the almost indestructible
Polypropylene material.
Porta-Boat is also used as a rescue craft by many municipalities
around the world
.
Many Portaboats are in use off the shores of Florida and the
Bahamas where skin divers use them on sharp, coral reefs.

They make "bullet proof" vests, rust proof highway signs and
automobile bumpers from this "stuff! How puncture resistant
can you get?