Depending on the customizability of the product, you need to know your skin type to manage your issues, understand what your skins undertone are, and the type of coverage you want. When choosing an undertone there are usually six to choose from including pink, peach, neutral, olive, yellow, and red/blue. Once you have an understanding of the correct undertone you can also define it more specifically and classify the color as warm or cool. Having this knowledge about your skin will help you find your perfect skin tone match. If you have doubts on which color, it is recommended to choose the lighter and shop from a company that allows returns.