Strengthened and resistant hair thanks to una Intensely hydrating mask | The strengthening mask KERASILK Specialists Strengthening Mask will help you improve the quality and appearance of fine, weak, or limp hair. It effectively strengthens and strengthens the structure of dry and weakened hair, providing intense and long-lasting hydration without weighing it down. Thanks to its hydration, it replenishes each hair fiber from within, leaving it up to 18 times stronger. You will also experience: una greater strength and 99% less hair breakage.