Alfaparf Yellow Liss Keratin Smoothing Progressive Treatment is a straightening treatment with a formula based on glyoxylic acid, a smoothing active ingredient that reshapes the hair fibers, and Kera Nutritive Complex, a complex of keratin, Murumuru butter, Babassu oil and Aloetrix.

Kit composed of:
- Nutritive Shampoo: cleanses and detangles hair, helps open the cuticles to prepare them for the straightening treatment.
- Smoothing Mousse: mousse formula for faster and easier application; reshapes the keratin chains, allowing the hair to gradually take on a straight shape.
- Nutritive Mask: intensely nourishes the hair, leaving it soft and silky.