A cervical cap is a small, dome-shaped device made of silicone or rubber that fits snugly over the cervix, the lower part of the uterus. It is used as a form of birth control to prevent sperm from entering the uterus during sexual intercourse. The cap must be used with spermicide to increase its effectiveness and can be inserted up to six hours before intercourse. Cervical caps are reusable and can be worn for up to 48 hours at a time. They come in different sizes, so it's important to consult a healthcare provider for proper fitting. While they are a non-hormonal option, they may not be suitable for everyone, and effectiveness can vary based on individual circumstances.