What it is: A lightweight post-styling serum that provides flexible, all-day hold for smooth, shiny, frizz-free hair. For use on dry and styled hair to hold and define style. Hair Texture: Straight, Wavy, Curly, and Coily Hair Type: Fine, Medium, and Thick Hair Concerns: - Hold & Style Extending- Shine- Frizz Key Benefits:  - Reduces frizz caused by humidity, for smoother hair that feels hydrated and conditioned after styling.- Creates immediate shine, definition, and lasting smoothness.- Delivers 2X longer hold.¹ Without the crunch. Highlighted Ingredients: - Chitosan: Locks in flexible hold.- Hyaluronic Acid: Reduces frizz.- Amino Acid Blend: Repairs signs of surface damage. *Dyson uses chitosan derived from oyster mushrooms, not shellfish in our styling range. Mushroom-derived chitosan offers a sustainable and non-allergenic solution for our active ingredient. Ingredient Callouts: Free of parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, sulfates SLS & SLES, triclocarban, and triclosan. What Else You Need to Know: Formulated for all hair types, this lightweight serum provides flexible hold with immediate definition and humidity protection. It conditions hair while locking in its shape with a flexible bond structure that won’t alter your hair’s natural texture. Chitosan, an ingredient derived from oyster mushrooms, allows each strand to move, flex, and recall its style in unison with the rest. Each bottle contains the equivalent of four to five oyster mushrooms’ worth of chitosan. Caveats:¹vs. untreated hair *Dyson uses chitosan derived from oyster mushrooms, not shellfish in our styling range. Mushroom-derived chitosan offers a sustainable and non-allergenic solution for our active ingredient. Fragrance Description: A unique and subtle blend of green and floral notes, Dyson’s signature fragrance unfolds with bergamot, basil, and tangerine.