My conclusion: through the material of this pillow is significant "non-slip" as the inflatable copies. However, the foam is seated relatively quickly flatten and, although I am from the "maximum permissible weight" a lot .... ;-)
In chronic tailbone discomfort this pillow may well be sufficient in case of rupture and therefore acute, severe pain, it is not to bring in my opinion, thick enough long-term relief. As an additional pillow and alternates with my "floating ring" but I am quite satisfied.
