On Tue, 28 May 2013 10:23:22 -0400, Metspitzer
wrote:

What would make a good insulating material for a water bed?

My niece has a water bed. The heater from the water bed makes her
room hotter than the rest of the house. I suggested that she take a
blanket and put it under the fitted sheet and try to turn the heater
down a few degrees. She says that even with the blanket, if she turns
the heater down any the bed is too cold.
The only water bed I ever had was a "hybrid" - it was a foam "bowl"
with the water bladder in it - quite effective