With just one treatment, Joico's K-PAK Color Therapy Luster Lock unlocks color vibrancy, shine, and strands that not only look healthier but are stronger. Benefits Maintains over 82% of haircolor for up to 8 weeks* Repairs & strengthens damaged hair** Instantly 9X stronger hair ¿ Twice the shine ¿ ¿ Boosts color vibrancy 9X stronger hair* 89% less breakage* Instantly healthier-looking hair * When using K-PAK Color Therapy Shampoo and K-PAK Color Therapy Luster Lock Multi-Perfector ** Against combing breakage on damaged hair vs. a non-conditioning shampoo ¿ Against combing breakage on damaged hair vs. a non-conditioning shampoo; when using Luster Lock Treatment ¿ ¿ vs. untreated hair; when using Luster Lock Glossing Oil