Dyson Chitosan™ Post-style serum Refill

This refill is only for use with your existing Dyson Chitosan™ Post-style serum and should not be used in isolation. Shop our full-size product here. Hold and hydrate your end style, with instant shine and definition. Chitosan, derived from oyster mushrooms, creates flexible bonds that support the hair, strand by strand, protecting your styles from frizz, even in high humidity.** Dyson signature fragrance is a blend of green and floral notes - sparkling bergamot, soft florals, warming cedarwood and musk.