It starts off really, really cool. I would say that it warms up to be slightly cooler than a normal pillow, but is much cooler than other memory foam pillows.
Note that the iso-cool fabric is only on one side of the pillow. So you can turn your pillow around but not flip it over.
i own that pillow, its too firm, gets hot. I own 2 actually, loved it and bought gf one, i got stiff neck from it over time.
bought this from costco a few days ago (LOVE IT) its super soft,firm too, perfect height, cools my head quite a bit for awhile enough for me to fall asleep. 90 day return policy at costco too