Bumble & bumble Prep is a nutrient-rich detangler that reveals texture, enhances the performance of styling products & quickly refreshes already styled hair without weighing it down. Who: Suitable for anyone but best for 'virgin' (uncoloured), ultra-fine, limp, relatively healthy hair. When: Use Bumble & bumble Prep when hair is damp to detangle & prepare hair for styling; anytime to dampen & reactivate products already in hair.