The power of Argan Oil The protection doesn't stop at the surface. The HSI Thermal Protector is infused with Argan Oil, which penetrates the hair shaft to provide deep, nourishing moisture and keep hair hydrated even with daily styling. Argan Oil provides silky smoothness without grease, weight or residue. It helps repair split ends and damage caused by the stresses of styling. Not only will you protect your tresses - you'll add gloss and deep hydration with each use.