Kirkland Signature Moisture Shampoo 33.8 Fluid Ounce Kirkland Signature Moisture Shampoo is an ultra-luxurious professional salon formula designed to gently cleanse hair while replenishing and maintaining moisture. This state of the art formula is sulfate-free and safe for color treated hair. This exclusive blend of Rainforest Botanical Extracts Avocado and Argan Oils provide hydration nourishment and help improve the overall performance manageability and vibrancy of hair.