XPLORAs are splash water proof (IP-code: IPx4 - Water splashing against the watch's enclosure from any direction shall have no harmful effect). That way your children can use their XPLORA during any kind of weather.
However, XPLORA is not a diving watch. Immersion underwater can severely damage your watch even beyond repair.
If your XPLORA has been immersed underwater, send it immediately in for repair. Even though it might seem to work just fine at first glance, intruded water can destroy your watch over time.
If your XPLORA has had an accident, don't take a risk and send it in!