What it is: A five-minute deep-conditioning mask formulated to help reconstruct strands that have been damaged by heat styling or chemical treatments.Who it's for: Ideal for those with weakened or damaged hair.What it does: The high-performance formula is rich in shea butter, argan oil and reparative proteins to restore hair from the inside out. How to use: After shampooing, apply a generous amount to towel-dried hair and comb through. Leave on for 5–7 minutes. Rinse thoroughly. This mask is highly reparative to the internal structure of the hair and should be sealed in afterward with a conditioner. Use once a week and less frequently as hair's health improves.