Cilong sheathing treatment (10 ml). Creating a sheath around the eyelashes and/or eyebrows, the sheathing treatment softens and gives elasticity while making them silky. Protects against all forms of humidity and weather and extends the lifespan of: Eyelash extensions. Eyebrow extensions. Semi-permanent mascara. Maintenance application: 1 to 2 times per day. The sheathing treatment will ensure better hold of your eyelash extensions.