What wrapping technique involves overlapping concentric layers of hair from the ends to the scalp?

The croquignole wrap is characterized by its specific technique of wrapping hair in overlapping concentric layers, starting from the ends and working towards the scalp. This method creates tight curls and adds significant volume to the hair. The foundation of the croquignole wrap lies in the direction of the curl formation, which is typically uniform and results in a consistent texture throughout the hair.

In this technique, the hair is sectioned and wrapped around the perm rod or roller in overlapping layers. This is different from other methods such as spiral wrapping, which typically involves wrapping the hair in a vertical motion, producing a different curl pattern and texture. Additionally, the rod wrap focuses on the specific placement of the rods rather than the overall layering technique. Pin curls, on the other hand, are created by curling sections of hair and securing them in place, which is not the same as the layering approach used in the croquignole wrap.

Therefore, the crux of the croquignole wrap technique is its unique overlapping method that leads to defined curls, making it the correct choice in this context.