If they are very flexible and very light-weight these are fine for walking along the sand or over rocks, but probably wouldn't give protection from a stone fish spine penetrating the sole.
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Stonefish spines are incredibly sharp and strong and can easily pierce through the boot of a wetsuit or water shoe.
Prevention. The best ways to prevent contact with a stone fish are to wear water shoes and shuffle your feet when wading in shallow waters. Water shoes may provide a barrier to the dorsal spines or reduce the depth of a puncture.