A professional leave-in smoothing spray serum formulated with Keratin Sealer 5% to smooth hair at the Keratin Alpha level. Heat-activated technology helps seal the hair's keratin structure for long-lasting smoothness, frizz and volume control while improving manageability and adding mirror-like shine. The lightweight formula protects against humidity and heat up to 230°C (450°F), is alcohol-free, artificial colourant-free, suitable for all hair types, and does not contain keratin.