Yes, Elf Hydrating Primer is silicone-based. It contains a blend of silicone and water, which creates a lightweight, smooth texture that glides onto the skin. The silicone helps to create a smooth, even canvas for foundation or other makeup products, while the water helps to hydrate and nourish the skin. The silicone also helps to create a barrier between the skin and the makeup, protecting the skin from potential damage and allowing the makeup to sit comfortably on the skin.