CORESTA Recommended Method CRM 40 offers a single measurement head size and ISO 2965:2009 adds a smaller head size to enable measurements of paper with bands of different, normally lower, permeability. These head dimensions have been used over many years for air permeability measurements of cigarette papers, including banded papers now used widely in the production of LIP cigarettes. The report explains the work done to extend the Recommended Method to include a measurement head area suitable for use with super-slim cigarette papers.