What is Sls-free and should I look for that when I buy products?

Sodium lauryl sulphate is the detergent that makes shampoos sudsy. It also dries out your hair and scalp, which is why conditioner becomes a necessary follow-up step — and why some guys choose to go a few days without washing. One alternative is to just cut out the SLS. “It may feel awkward at first, like massaging lotion into your scalp,” says Wes Sharpton, lead stylist at Hairstory, a hip New York hair studio that produces its own Sls-free shampoo, “but you’ll notice that your hair will feel soft and less puffy.”