One n' Only Strengthening Restorative Hair Mask contains Argan Oil and acacia collagen to repair dry, damaged hair and help combat signs of aging hair. This intense moisturizing leave-in conditioner nourishes, hydrates, and moisturizes hair to promote new follicle growth and regenerate hair for smoother, healthier-looking hair. This deep conditioning mask penetrates the hair cuticle to reconstruct, repair, and strengthen the hair and help to restore its elasticity.