Finally!!!! After trying over 20 pillows, I have found Hullo!
I have tried everything from memory foam, down, synthetic, cooling pads, wool, and no matter what, I would wake up with a hot, sweaty neck which caused me great neck pain/tension throughout the day.
The first few days felt strange, but now I am so used to it and absolutely love it. My son is having the same problem and I just ordered one for him.