This paper considers the potential for securitizing index-based insurance products that transfer weather and natural disaster risk from lower income countries. The paper begins with a brief overview of why markets for natural disaster risks are important in lower income countries and then reviews some recent activities using index-based weather insurance. Next, the paper explains how natural disaster risks are handled in higher income countries. These examples along with the example of an innovative index-based livestock insurance pilot project in Mongolia illustrate how layers, or tranches, of natural disaster risk can be financed during the product development phase by creating structures similar to the Special Purpose Vehicles used in catastrophe bond, mortgage bond, and the emerging microfinance bond markets. We refer to these investment alternatives as micro-CAT bonds since the principal amounts would be small relative to the existing CAT bond market.