It's FM (****ing magic). Not seen any in-depth explanations -- only bits & pieces here & there. There's a little bit on page 14 of the following page. This guy talks about 3 brands of tape (have only seen 2 so far). I believe that it was written in the past 2 months so it is fairly current. Azata.net/meetings/winter2010/BACAElasticTherapeuticTaping2.pdf .