The GKhair Light Wave, Curly and Resistant formulas are professional in-salon treatments that penetrate the cuticle to improve texture, enhance manageability and reduce frizz for 3-5 months. The GK Hair Taming Formulas restore and protect maintaining hair's natural properties by creating a shield over each strand, restoring it from the inside out; while protecting against harmful UV rays, pollutants, chemical treatments and the rigors of daily shampooing and styling. This is a 2 hour treatment.