Infuses the hair with nano-tech ME-10 silicones that go deep into the shaft and stabilize color with a protective shield on each color molecule. Humidity resistant formula keeps scrunched hair alive and vibrant and curls flexible but stable all day. Enhances and illuminates hair color with Optical Brighteners. Sulfate Free Volumizing Formula Protects your hair as you creatively mold, swirl, curl or spike. Great for straight hair too.