Biolage Strength Recovery Deep Treatment Mask is an intensive, rinse-out treatment designed to deeply nourish and repair damaged, over-processed hair. Infused with vegan squalane, this rich, buttery formula penetrates the hair fiber to strengthen, restore elasticity, and reduce breakage. In just five minutes, hair feels noticeably softer, smoother, and more resilient. Ideal for weekly use to revive even the most fragile strands and maintain long-term hair health.