The latest addition to the Biolage Deep Treatment Pack hair mask collection . Will make your hair stronger and ready for the day with Biolage Advanced FiberStrong Deep Treatment Hair Mask designed to gently strengthen fragile hair and give it the boost it needs. Enriched with Bamboo extract to target and repair damaged hair. Small with a mighty punch each pack contains at least four applications. Easy to applicatiion just squeeze, these packs are lighter than a container of the same size and perfectly sealed for a fresh application each time.