• Dyson Chitosan™ Post-style serum is a lightweight post-styling hair serum that provides flexible, all day hold for smooth, shiny, frizz-free hair. • 2x longer hold with up to 50% less frizz.** • Formulated for all hair types, this lightweight serum simultaneously conditions individual hairs, while locking their shapes with a flexible bond structure without compromising your hair’s natural feel. For use on dry and styled hair to define style. • Chitosan, derived from oyster mushrooms, creates flexible bonds that support the hair, strand by strand - protecting your styles from frizz, even in high humidity.** • Contains amino acids to repair signs of surface damage and hyaluronic acid to reduce frizz caused by humidity, for softness and shine. • Lightweight serum for even application to smooth, define, and enhance styles. • Dyson signature fragrance is a blend of green and floral notes - sparkling bergamot, soft florals, warming cedarwood and musk. • Precision pump is engineered to dispense an exact amount of product every time, for controlled usage. • Use on dry hair, after styling with your favourite hair tool. Pump to dispense product. Start with 1-2 pumps adding more as needed. Sheer between palms. Smooth through mid-lengths and ends. For best results, use with the Dyson Chitosan™ Pre-Style Cream on clean, wet hair before styling for maximum retention. • All Dyson full-size formulation products are refillable. Order a refill and follow instructions on the cartridge to replace. *vs. untreated. **vs. untreated hair. Tested at relative 80% humidity.