What it is: A quick-absorbing, oil free formula that delivers powerful UV protection. What it is formulated to do: Kate Somerville Protect SPF 55 Serum Sunscreen is a mild, water-resistant complex that harnesses cutting-edge technology to provide broad-spectrum, UVA/UVB sun protection sans white residue, greasiness, or stickiness. This complexion care essential offers a rich dose of antioxidants for further protection against damage and premature aging. What it is formulated WITHOUT: Parabens. What else you need to know: This formula is ideal for daily use and suits all skin types, including oily and problematic skin.