SkinCeuticals Ultimate UV Defense SPF 30 is ideal for daily use and perfect for high-altitude climates. This elegant formula also helps increase the skin’s moisture content, leaving the skin feeling smooth and comfortable. It gives your skin the sun protection it needs on a daily basis. This true broad-spectrum sunscreen contains 7% transparent zinc oxide to help protect against the damaging effects of UVA and UVB rays. Apply daily to face, neck, and chest or apply liberally before sun exposure. Use before applying makeup. Reapply every two hours and after swimming, excessive perspiration or after towel drying.