The basics Bumble and bumble Straight Blow Dry delivers straight, smooth, healthy-looking styles with heat styling.  The benefits Straight Blow Dry is free of formaldehyde, cysteine, and lye and is safe for color-treated hair. The uses This lightweight formula tames flyaways and frizz, while protecting hair from heat-styling and humidity . Hair is left lustrous, beautiful, and silky soft.  The bottom line Formulated for curly, thick, unmanageable hair utilizing Bumble and bumble's breakthrough Concen-straight Technology™.