A menstrual cup is a type of feminine hygiene product which is usually made of medical grade silicone, shaped like a bell and is flexible. It is worn inside the vagina during menstruation to catch menstrual fluid (blood). About every 4–12 hours (depending on the amount of flow), the menstruating woman removes the menstrual cup from her vagina, empties the collected menstrual blood into a toilet or sink, washes the cup under running water and inserts it again. At the end of the monthly period, the cup can be sterilized, usually by boiling in water. Unlike tampons and pads, the cup collects menstrual fluid rather than absorbing it.
Manufacturers have different recommendations for when to replace the cups, but in general they can be reused for five years or more.
Companies promote menstrual cups as a better alternative to pads and tampons by marketing them as more practical, cheaper, and eco-friendly.
The menstrual cup is a bell-shaped cup made of rubber (latex), silicone or thermoplastic elastomer (TPE). It is reusable and designed to last for up to 10 years. Some brands recommend replacement each year, as it is a hygiene product. Other brands recommend replacement after 5–10 years, stating that women have been comfortable using them for up to 10 years. These bell-shaped silicone or rubber cups must be removed before penetrative vaginal sex.
Most brands have a smaller and a larger size. The smaller size is normally recommended for women under 30 who have not given birth vaginally. The larger size is normally recommended for women who are over 30, have given birth vaginally, or have an unusually heavy flow. The menstrual cups with the smallest size diameter are recommended for teenagers, as well as menstruating women and girls who are more physically fit, as those with stronger pelvic floor muscles may find a larger cup uncomfortable. Length also needs to be considered: if a female's cervix sits particularly low, she may want to use a shorter cup. Capacity is important to women who have a heavier flow; however, all of the menstrual cups currently available have a larger capacity than a regular tampon.