The Framesi Straightening System Strong is a highly protective, formaldehyde-free straightening system that helps hair acquire new texture with a short processing time. It removes frizz, leaving hair sleek, smooth, and more manageable. Silis allows you to create texture by refining natural curl through relaxing, curl reduction and redirection of natural growth patterns. Silis has a lower pH than conventional relaxers, allowing you to create stunning effects while preserving the integrity of the hair.