For normal and previously waved hair. 1 application. Exclusively patented for normal and previously waved hair. Thio-free formula. Diffuses more evenly than conventional waves to minimize swelling of the hair shaft. Equalizing pre-wrap. Our patanted Equalizing Pre-Wrap ensures optimal results due to nourishing combination of naturally derives plant extracts with vitamins and proteins that equalize hair porosity and fortify damaged regions of the hair prior to waving. ISO empowers you to even previously waved hair.