Develop a cooling pillow that maintains temperature neutrality throughout the night

Lately I keep seeing ads and posts claiming their pillow stays “ice cold all night,” but every time I try one it’s basically a lukewarm brick by 3 AM. Cooling gels, ventilated foam, phase change materials… they all sound great on paper, yet so many of them seem to lose their effect once you’ve been on them for more than ten minutes. So here’s where I’m stuck. I’m a ridiculously hot sleeper and it’s gotten worse now that the weather’s warmed up. I’ve tried a shredded memory foam pillow, a gel-top foam pillow, and even one of those fancy PCM covers. All of them start cool but eventually trap heat and then I’m flipping the pillow over and waking up constantly. I’m not expecting arctic temps, just something that *stays* neutral instead of cooking my face. If you’ve found a pillow that legitimately helps regulate heat long term not just first contact what worked for you? Materials, brands, designs, anything. Also curious if anyone here switched to latex or buckwheat and found real nighttime relief. Open to all suggestions because I’m about to give up and sleep directly on an ice pack.