KOSE STEVEN KNOLL Premium Sleek Deep Repair Serum 50ml An intensive night serum that deeply repairs damaged hair while you sleep. Designed for hair with severe damage, split ends, or breakage, this concentrated night serum works from within to restore strength and smoothness. The Deep Repair Complex (high-penetration moisture capsules + Vitamin E) infuses deep into the hair, leaving it silky, hydrated, and beautifully tamed to the ends. [How to Use] After towel-drying, apply 1–2 pumps to your palms, spread evenly, and work through the ends or areas of concern.