Protect yourself during outdoor activities with EltaMD SPF 50 UV Sport Water-Resistant Sunscreen A water-resistant formula that stays on during swimming, watersports and perspiration, this powerful sunscreen prevents UVA and UVB rays from damaging your skin without being irritating. Vitamin E provides high-powered anti-aging benefits that reduce the look of fine lines and wrinkles. Reapply every two to three hours to maintain protection.