Laura Sims Masque Nourrissant Profond Ultra Riche refers to a product associated with the brand "Laura Sims." Based on the name, it suggests that it is a deeply nourishing and rich hair mask. Hair masks are intensive treatments designed to provide deep hydration, nourishment, and repair to the hair. a nourishing and deep conditioning hair mask typically contains ingredients that help to moisturize, strengthen, and repair the hair. These masks are often formulated with rich oils, butters, proteins, and other nourishing ingredients that can penetrate the hair shaft to restore moisture and promote overall hair health. To use a hair mask like Laura Sims Masque Nourrissant Profond Ultra Riche, it is typically applied to clean, damp hair after shampooing. The mask is usually distributed evenly throughout the hair, focusing on the mid-lengths and ends.