I don't believe any of them are, from my experiences...
Obv fibre products will wash out in the rain, shower etc.
Dermmatch claims to be somewhat water-resistant, and some users claim to go swimming wearing the stuff. I can't believe these claims however - it runs terribly with any appreicable amount of moisutre. I have found myself wiping down a smudged forehead in the gym....embarassment much? Yessir...
I had higher hopes for the boldly named Aquamatch! It is supposed to 'seal' in on the scalp after maybe 10mins from application, but I find that it is always prone to be rubbed off or smudged.
And these concealers all state that they require a shampoo to be washed off. Not in my experience. Even aquamatch runs off simply by running water off my head.....
I apply them conservatively but maybe my technique is just crap.... A genuinely water-proof concealer would be a godsend...
brsrkr69