When your extensions or your own hair is in  of some CPR to bring back life into them. Then this is the stuff to do it.Extension Boost Mask is a deep conditioning treatment that can bring back life into the most damaged weakend hair. It has the strongest vitamins and minerals to feed the hair and smooth down the cuticle to take away frizz  and bring back shine. It works best if it's used with my extension shampoo, conditioner and vitamin spray.