I use 2 standard sleeping pillows stuffed into one pillowcase
between my knees and use it in different positions.
The cooler parts of the pillowcase get rotated thru the night.
My aim is to stay cool. Feet and legs and groin area burn, but
sometimes about 3 or 4 am I wake to 'ice feet' and have to shove them up to the ankles, under the comforter. Can't stand to sleep with any clothing on below the waist. Needless to say, I sleep without/on top of- the covers or sheets. I use a standard, window box fan, on the floor at the foot of the bed - set to medium high, even in winter.