Tigi Bed Head Colour Combat Dumb Blonde Leave In Conditioner. Do Dumb Blondes have more fun? Um, yeah because this lightweight leave-in does all the work! Its packed full of defending ingredients to boost the strength that bleached & over processed hair lacks & our Colour LockDown Technology helps secure hues to increase the vibrancy of your gorgeous tones. And bonus… this formula protects from the common, ho-hum dull hair that UV damage can cause.