THE SKINNY: Kerastase continues to impress with its Age Premium Masque Substantif, a deep conditioning treatment designed to add new suppleness and shine to your hair.
This is one of the lightest conditioners I've tried in a while, and it rinses out easily. Like the Bain Substantif shampoo, this left my hair silky smooth, happy and bouncy.
Using it just once a week adds a lot of natural-looking volume and moisture to my fine hair without making it look greasy or dull.
KEEP OR TOSS: Keep. I wish the product was less expensive so I could use it regularly.
CHECK IT OUT: Kerastase suggests leaving this masque on for five to 10 minutes before rinsing it out.
-- Tested by Shay