It has been independently tested against air-drying.

In a laboratory study conducted by Bio Basic Europe and the University of Pavia, human hair strands were put through eight wash-and-dry cycles, simulating one month of use. Hair dried with Diffon Pro Curl was compared with hair left to air-dry.

The study found no statistically significant difference in hair damage between the two groups.

Independently tested. As gentle as air-drying.³