A menstrual cup is a type of reusable product to collect period fluid made of rubber or silicone. It’s a small, flexible funnel-shaped cup you insert into your vagina. It is an eco-friendly alternative to tampons and sanitary towels. There are different sizes to fit different positions of the cervix and the menstrual flow. Age, flow and position of cervix can affect the fit so it is important to research what is best for you.