ISO's exclusive, patented, thio-free formula utilizes Isoamine, a naturally derived waving agent. Isoamine penetrates more deeply and evenly into the hair than conventional waving agents without aggressively lifting the cuticle. Since the internal structure and integrity of the hair is not disrupted, there is no need for conditioning additives that can hinder the perming process. The result is resilient curls and healthy hair. Option 1 is designed for: Normal and previously permed hair Fine to medium texture Normal to moderately porous previously permed hair Easy to wave hair, shorter lengths Experience the benefits of ISO Option 1: Added pre-wrap No heat required Curl Pattern Soft Hair Type Normal, Previously Permed Formula Cysteamine Thio-Free SKU 2694158