I was so excited for this product as I can't sleep if I'm too warm and I love the cold side of a pillow! First of all, I got it and it was nearly impossible to let the air out like they said. Water spilled everywhere. I had 3 people working on it! Sure, it's cool for a little while. But after a few hours of sleep that thing REALLY heats up! I woke up one morning after about 8 sweating profusely because it had gotten so warm. Unbearably hot! It doesn't work...You know what people say about how if it sounds too good to be true it probably is? In this case, it is.