100% Natural, Chemical-Free total sun block for adults that is Marine and Reef Friendly. This sunscreen lotion is Biodegradable and perfect for those wate enthusiasts that are active in Diving excursions; snorkeling; and overall water activities. Many, if not all, Dive Destinations require Biodegradable sunscreen in order to participate in reef dives and explorations, due to the determination that chemical based sunscreens are the reason for many of the natural coral reef systems being killed. Our formula uses the natural minerals, Titanium Dioxide and Zinc Oxide, the only known natural combination that will reflect both UVB and UVA rays from the skin. There is 9% Titanium Dioxide and 3.5% Zinc Oxide in the formulation, providing complete and total UV block capabilities. Do not vigorously rub the lotion on the areas of protection. Simply use your hand as a paint brush and gently wipe the lotion on the areas of need. This way, you do not energize the whitish hue of the Zinc Oxide. Pay close attention to areas where the bone is closest to the skin like the shoulders, the face and the tops of feet, bathing suit lines, as these areas tend to be areas that burn easily. Apply every hour to hour and a half. As much as the need for a sun block is, the skin must have hydration abilities to maintain its normal temperature while exposed to abnormal heat conditions. The SolGuard spf 25 includes Organic Aloe Leaf; Cucumber extracts; organic Jojoba; and various tropical plant extracts from the Caribbean to inject and sustain moisture in the skin keeping it cool, so as not to overheat. Natural Anti-Oxidants and Natural preservatives are used such as, Green Coffee Bean: Wild Pansy extract: Sunflower Oil; and Natural Vitamin E from corn make this 100% natural sunscreen. No parabens are used as preservatives and the use of a food grade sorbate provide natural preservative abilities to allow for a 24 month shelf life. SolGuard spf 25 is water-resistant and does not come off upon entry into water.