Shiseido Crystallizing Japanese Hair Straightening is an innovative new technique from Japan to make frizzy, curly or wavy hair completely straight while preserving the hair's health. This 2 step straight permanent system contains H1 STRAIGHTENER & NEUTRALIZER CREAM, which are permanent solutions that are used with a hot hair iron to make your hair smooth, shinny & straight. Leaves hair shiny, smooth and silky straight for up to 2 months. Suitable for men & women.