The pillow is cool to touch. Took a few nights to get use to it and or break it in. It has kept me from getting hot. Which is an improvement. I would not say it cool all night. Probably more like a neutral which has made me more comfortable sleeping. Definitely not hot or even warm.
Love the comfort and great support each night. I no longer need two pillows for comfort! They keep cool throughout the night, even for my wife, the Human Furnace. Our only negative is that the pillowcases inevitably shimmy off during the night.