Say goodbye to weak and fragile hair with Biolage Advanced FiberStrong Fragile Strengthening Hair Mask. The newest addition to the much loved Biolage Deep Treatment Pack hair mask collection. Make your hair stronger and ready for the day with Biolage Advanced FiberStrong Deep Treatment for Fragile Hair designed to gently strengthen fragile hair and give it the boost it needs. Enriched with Bamboo extract to target and repair damaged hairs. Use up to twice a week alongside the Advanced FiberStrong haircare collection.