I think it has to do with the compression that calms things down. Some people sleep better under a weighted blanket. The Thunder shirt does work with many dogs. It also makes me think of Temple Grandin’s squeeze machine to help calm the nerves of autistic people.
FYI, the “liquid” part of the name of the mask refers to the type of FABRIC and nothing else about the mask. I did some research on these a number of years ago and found that out. I have no idea if the titanium does anything but I did find a Golf hat that also had titanium.