Estee Lauder Double Wear Sheer Long-Wear is a liquid foundation that is designed to provide a sheer to medium coverage with a natural-looking finish. The shade 1N1 Ivory Nude is a light shade with neutral undertones, suitable for those with fair skin tones. This foundation is formulated to be long-wearing, lasting for up to 12 hours. It is also oil-free and non-comedogenic, meaning it won't clog pores or cause breakouts. The formula is designed to be lightweight and breathable, allowing the skin to breathe and preventing the foundation from feeling heavy or cakey. Estee Lauder Double Wear Sheer Long-Wear is also designed to provide a degree of sun protection, with an SPF of 19. However, it is still recommended to use a separate sunscreen for adequate sun protection. To use, you can apply the foundation with a makeup brush, sponge, or your fingers, starting in the centre of the face and blending outwards. You can build up the coverage as needed, and set with a powder if desired for added longevity. Overall, Estee Lauder Double Wear Sheer Long-Wear in the shade 1N1 Ivory Nude is a great option for those looking for a natural-looking, long-wearing foundation with a sheer to medium coverage.