Genesis Homme Spray de Force Épaississant by Kerastase is a boosting hair spray made to strengthen and thicken hair prone to thinning. Thickens every hair fiber for a fuller, stronger hair mass. Instantly gives sensation of more hair volume globally. Provides instant volumizing hair for 24H and texture from the roots with a natural look. +25% more hair mass after 1 application +5% increased hair diameter Light hold, non sticky that instantly thickens every hair fiber for a fuller, stronger hair mass. HOW TO USE Step 1: Spray the Spray de Force Épaississant into hands. Step 2: Work through wet hair. Step 3: Do not rinse.