What it is: A sulfate-free cleanser that reduces frizz. What it does: This ultra-mild cleanser reduces pesky flyaways, helping to smooth and soften hair with Concen-straight Technology®. It's the ideal shampoo for taming curly, thick, unmanageable, unruly hair. What it is formulated WITHOUT: Parabens. Sulfates. What else you need to know: The Bumble and bumble Straight Line with breakthrough Concen-straight Technology™ was developed to help maintain hair's natural integrity, allowing hairdressers (and clients) to customize straightness, increase manageability, and reduce frizz. All products are free of formaldehyde, cysteine, and lye. Straight Shampoo is safe for color-treated hair.