Seal the deal with SILKY:SMOOTH Heat Activator, the final step in completely transforming your hair. This leave-in spray works to deliver a powerful heat-activated polymer that provides an invisible barrier around the cuticle that seals in moisture and nutrients while locking out frizz caused by humidity. It's also safe for hair extensions and to add on after chemical services to help lock in color, repair damage and seal the cuticle. The result is dramatically smooth and shiny hair that lasts for days, even after a few washes. VEGAN CRUELTY FREE.