Please note: This item requires a compatible Clinique iD Cartridge to use. A revolution in skincare technology; the Clinique iD is a two part treatment that allows you to combine this base with a compatible Clinique iD cartridge, creating a treatment tailored to your skins needs. Custom-Blend Chemistry Technology ensures that the active ingredients of both the base and the cartridge are delivered to the skin with every pump. Ingredient potency is maintained. Intense, lasting hydration contained with an incredibly light water jelly. The Dramatically Different Hydrating Jelly uses Clean Shield technology to lock moisture into the skin for up to 24 hours. It reinforces the skins natural barrier which allows for increased resilience. An oil free formula that is non-sticky and doesnt leave residues. To use: Insert a Clinique iD cartridge into this base making sure the cartridge is held firmly in place. Apply mornings and/or evenings to the cleansed face.