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The Straight Line features Bumble and bumble's very own (and very rare) gemstone blend that loosens hair's natural curves - just add heat. It's part of our new breakthrough smoothing technology that improves hair condition over time for lasting softness and increased manageability. For: The curly, thick, coarse, frizzy, unmanageable, unruly (or any combination thereof). When to use: Whenever you wash, after using Straight Shampoo. How to use: After cleansing with Straight Shampoo, smooth evenly through hair and let sit a minute or two. Rinse. Follow with Straight Blow Dry for smooth heat-styling.