Loreal Hair Expertise EverStrong Overnight Repair Treatment is a leave-in formula with our patented Bio-Ceramide Complex. It penetrates the hair fibre while you sleep to improve strength after just one use. It also absorbs quickly without leaving residue on your pillow. Introducing formulas so gentle, yet so strengthening. Free from harsh sulfates, the EverStrong Sulfate-Free Fortify System contains our patented Bio-Ceramide Complex, which strengthens the hair fibre after just one use, helping it resist breakage.