This is one of the most well-known menstrual cup folding methods. According to Cora, it involves flattening the cup and folding it in half, bringing each end of the rim together so it forms the shape of a "C." From there, you're able to guide the folded cup into the body, letting go once it's in place. Lunette, another menstrual cup brand, offers this helpful YouTube tutorial if you need a visual of how to create the "C" fold.