that night one of our hunters got hypothermia because he was sleeping on an
inflatable mattress.

I think there's something missing from this picture. Though usually by
inflatable
one means the inflatable insulated pads even a plain uninsulated air mattress
shouldn't "cause" hypothermia if the hunter had a proper bag. Air does provide
some insulation.
-- so much fishing, so little time --
--please remuv the 'NOWAY2it' from my email addy to email me--