This break through product was developed to help meet the needs of those with sensitive skin and those who are concerned about skin cancer causing UVA rays. The SPF 30 was achieved by using Z CoteAR Transparent Zinc Oxide plus existing, proven sunscreens. Experts consider Zinc Oxide to be the most effective sunscreen against cancer causing UVA rays. For centuries, it has been used to protect and soothe the skin. Classified by the FDA as a Skin Protectant, it prevents chapping, cracking, and windburn.