Kérastase Resistance Extentioniste is a specialized two-step care program designed to strengthen the hair’s internal structure and help hair reach its desired length. The set includes Bain Extentioniste shampoo (250ml) and the intensive Masque Extentioniste mask (200ml). These two products work together to protect damaged, breakage-prone hair, delivering up to 4 cm longer hair in 3 months.

The Kérastase Bain Extentioniste shampoo (250ml) provides a rich cleanse that respects the hair while also helping to activate and protect the scalp environment. Its formula penetrates the fiber to restore weakened bonds, significantly reducing damage from the roots. From the very first use, it prepares the hair to receive nourishing ingredients, leaving it light, clean, and visibly more resilient.

The second step of the routine is completed with Kérastase Masque Extentioniste (200ml). This intensive treatment mask penetrates deep into the hair cortex to strengthen and protect the cuticle, coating it evenly. Its action seals the scales and damaged ends, offering 99% less breakage and 78% less split ends. With use, the hair gains exceptional elasticity, smoothness, and an even structure along its entire length.

The high effectiveness of the Extentioniste range is based on a powerful complex of active ingredients. The innovative Creatine R complex is combined with taurine in the shampoo to stimulate the natural barrier of the scalp and strengthen the core of the hair fiber. At the same time, the addition of maleic acid (Maleic Acid) in the mask acts as a binding agent that reinforces the bonds of the fiber and shields the outer layer, protecting the hair from future thermal or mechanical damage.

This professional set is ideal for weak, brittle, or damaged hair seeking healthy length. It is the optimal solution for those who notice that their hair “stops” growing due to constant breakage at the ends or split ends caused by styling and chemical treatments. Regular use of the routine restores hair to excellent condition, providing rich nourishment, softness, vitality, and natural movement without reducing its volume.

• Step 1: Apply the shampoo to wet hair, gently massage to create a rich lather (emulsify), and rinse carefully with plenty of water. 
• Step 2: On washed and well towel-dried hair, apply the mask evenly to the lengths and ends, gently massaging each strand. 
• Step 3: Leave the product on for 5 to 10 minutes so the active ingredients can be fully absorbed, then rinse thoroughly. Use the mask 1 to 2 times a week.