Evo Lockdown Smoothing Treatment is a leave-in treatment that will smooth frizz, add shine and give style control. Evo Lockdown Smoothing Treatment is perfect for frizzy and unruly hair. concept. a leave-in treatment to smooth and help prepare the hair for styling whilst improving shine and manageability. benefits. softens and smooths the hair from root to tip. conditions and enhances shine, improving combability and reducing frizz. recommended for. frizzy, unruly, colour-treated hair. Ideal for frizzy, unruly, colour-treated hair. Softens and smooths the hair from root to tip. Conditions and enhances shine, improving combability and reducing frizz. Improves hair manageability and gives style control.