The Olaplex The Instant Hydration Set (4 Pcs) is a limited-edition haircare routine powered by patented bond-building technology to deeply hydrate, soften, and repair dry or damaged hair. This four-piece collection features travel-friendly sizes of the iconic No. 4 Bond Maintenance Shampoo and No. 5 Bond Maintenance Conditioner for 90% smoother detangling, combined with a premium sample of No. 0.5 Scalp Longevity Treatment to nurture a healthy scalp environment. The star of the set is a full-size No. 5 Leave-In Moisture and Mend Leave-In Conditioner, which locks in weightless moisture and seals split ends to leave your hair looking radiant, stronger, and completely revitalized.