I think the original cooling mattress was waterbed with no heater.Not gonna lie -- I've bought:
Cooling pillows;
Cooling sheets;
Cooling blanket; and
The heat has been out the past 2 days.
I've slept better the last 2 nights than I have since I had my accident. Still waking up several times a night but not as many because I guess the hot flashes are minimized or something. All I need now is a cooling mattress!! Man, technology is grand!