Obagi Nu-Derm Sunshield SPF 50 is a lightweight, oil-free, non-comedogenic, non-irritating sunscreen that provides protection against both UVA and UVB rays. It is formulated with 4.7% zinc oxide and 4.9% titanium dioxide for exceptional protection. This broad spectrum sunblock resists water for up to 40 minutes and dries clear, making it perfect for everyday wear under makeup. It contains ceramides to help repair and restore the skin's protective barrier, plus niacinamide, a vitamin B derivative, to help support natural ceramides and fatty acids.