Turns into a heating pad
The pad itself is very small - I can't fault the listing, because it's clearly defined, but it's just nowhere near the size of the pillow.  It does work at first, it feels cool, but that sensation goes away pretty quickly, and you'll be woken up in the middle of the night by how warm this thing gets.  It's a good idea - it just doesn't work all the way through the night.
Rating: 2 stars