Silk proteins help form a transparent, crystalline film that protects and seals hair cuticles. Best for dry, weak, brittle, damaged and chemically-treated hair as the silk proteins penetrate, revitalize and strengthen hair. Natural pearl proteins rejuvenate and fortify hair. Their rich moisturizing properties keep color-treated hair from fading. Pearl proteins work together to give hair enhanced elasticity, vibrancy and luster. Pearl proteins also help protect hair from harsh UV rays.