is this not enough? its pretty clear to me. not only is it written on the garment,
they are obviously thinner. I'm no genius, got a couple years of community college under my belt. I can figure it out. My kids all wear type III and i take the risk with my non approved. I never use it on public lakes though. Only at home on our ski lake.
Plus , last time I checked , tubing was not a tournament event . Not yet at least!