I don't mean to judge, but I'm going to:
I was out for a ride on the local MUP today, not a cloud in the sky, about 30degree weather (works out to about 80 F, I think), reasonably humid, all in all a hot day. Along the path, I found a mom and her two kids (about 8-10 yrs) sitting in the shade, their bikes near by. Both the kids were bright red and barely sweating, showing the first signs of a heat emergency (heat stroke/exhaustion). The mom said that she had brought a single half-litre bottle of water for the three of them for this trip, and they had gone about 3 miles. I have the kids some water out of my camelbak to keep them from getting any worse. I just want to say this:
there is nothing more important when your kids are performing physical activities than HYDRATION. all the safety gear in the world won't stop them from overheating and succoming to illness.
thanks for letting me rant.