Cool. Have you tried wrapping your yoga mat around it? It should be quite soft, except for the edge?
I'm skeptical about their
"myofascia-adhesion" theory though. Take this anatomical view of a leg, for example:
The layer between the skin and muscles is very thin, it doesn't touch the bulk of the muscle fibers, and there doesn't seem to be much room for movement between the layers anyways. I'm not saying massaging is therapeutically useless necessarily, just that the explanation given in that article doesn't seem to add up :P.