Which characteristic of styling products is NOT included in their typical characteristics?

The characteristic of styling products that does not typically fall under their main features is the ingredients used. When discussing styling products, professionals focus primarily on aspects that directly affect the product's performance and visual appeal, such as hold level, shine factor, and texture.

Hold level refers to a product's ability to keep hair in place, which is essential for styling longevity. Shine factor indicates how much luster a product imparts to the hair, influencing how healthy and vibrant the hair appears. Texture denotes how a product can change the feel and look of the hair, whether making it smoother, more voluminous, or adding definition.

While ingredients are certainly important for understanding the formulation and possible effects on hair health or allergies, they do not describe how the product will perform in terms of styling characteristics. Therefore, focusing on hold, shine, and texture provides more immediate and practical information about how a styling product will work for hairstyling purposes.