Rusk Thermal Shiny Str8 - Permanent Straightener (formaldehyde-free) - Rusk Thermal Shiny Str8 - Permanent Straightener is a formaldehyde-free, intensive reconditioning therapy system. Also known as the &quot;Japanese Straightening&quot; or &quot;Thermal Reconditioning&quot; system, the Rusk Thermal Str8 Internal Restructing System permanently straightens excessively curly or wavy hair while leaving it in optimum condition.The Rusk Thermal Str8 system is then used with the Rusk Ceramic Str8 Iron, resulting in…