Treat while you sleep and help hair recover overnight from daily heat styling with hair dryers, flat irons and curling irons. This reparative hair mask with HeatCTRL® technology mends damaged strands, replenishes moisture, and smoothes and seals the cuticle, while helping protect against future damage. The rich, replenishing formula leaves all hair types softer and more manageable without leaving a residue on your pillow. Just apply one to three pumps of this leave-in conditioner on clean, damp hair at bedtime and wake up to restored hair, no need to rinse in the morning.