Hi stbwolfe,
You can read a little more about phase change gel (and other types of gel materials) in post #2 here and the other posts it links to.
Their “advanced” gel memory foam actually uses several technologies that help the memory foam sleep cooler and one of these is phase change gel. It is a very high quality memory foam.
the current forum setting don’t allow powerpoint files as attachments but if you email the file to me (at the contact link at the top of the page) I’ll see if I can change the settings and attach it to your post if you’d like.
Phoenix