Oh, rash guards are most definitely not wet suits, I wasn't intending to imply that. Just for what the parent was using them for (protecting kids while doing what sounds like playing in the lake) they sound like they'd be a better fit than a wet suit.

"UV shirt" would be a far more sensible name than "rash guard", I admit. That was just the name I learned for them when I first found out they existed. (Which was in Hawaii, under a brutally unforgiving sun.)