Purpose, design, words. All of the above matter.
Dry Robe change mat "has been designed to give you a clean, dry surface to stand on whilst getting changed."
Fair play. The outer / under shell is treated so will 'repel' water, but if on a wet surface that you then stand on - hard no - water comes through, and the entire point gone.
Any ideas beyond cutting it open and putting some plastic sheet in before re-stitching? #dryrobe #seaswim