Make sure you look for a Broad-Spectrum Sunscreen. That means it will protect against both UVA, rays that age the skin, and UVB, rays that burn skin. The FDA recommends an SPF of 15 or higher, anything less will put you at a greater risk of burning. Lastly, a clean sunscreen should feature Non-Nano Zinc. This means the zinc particles are kept in their natural state, thus not entering the bloodstream. Non-Nano Zinc just sits on top of your skin, creating a reflective physical barrier between your body and the sun.