A weightless, humidity-halting spray with ingredients that help protect hair from UV damage and stop frizz in its tracks for 72 hours of heat-safe, silky-smooth strands. Frizz Block Smoothing Spray creates an impenetrable veil of humidity-blocking, frizz-stopping, moisture-locking mist that protects strands for 72 hours. Created for harsh humid conditions, this alcohol-free, heat-activated spray is the prescription-strength equivalent of traditional anti-frizz sprays.