Nexxus Sleek Memory Straightening Smoothing Spray. Train your hair to become straighter, smoother, and less frizzy over time. Sleek Memory Straightening Smoothing Spray works with your heat appliances to teach hair to remember your straight, sleek style each time you straighten it, so your straightening routine becomes faster and easier. Scientifcally-proven heat protection guards against the intense heat from blow dryers and flat irons.