"SLS-free" refers to products that do not contain sodium lauryl sulfate (SLS), a common ingredient found in many personal care items like shampoos, body washes, and toothpastes. SLS is used for its ability to create lather and remove dirt and oil, but it can also be harsh on the skin and hair, potentially causing irritation for some individuals. Choosing SLS-free products is often recommended for those with sensitive skin, allergies, or specific skin conditions. These alternatives typically use milder surfactants that cleanse without stripping natural oils, making them a gentler option for daily use.