Do many girls want to know what is a menstrual cup or what is a period cup? There has been a lot of concern when it comes to the usage of pads and tampons during the periods. What can be the Best Alternative that can help the environment and can keep you physically fit as well? The answer to it is the reusable menstrual cup. It is a reusable hygiene product in a funnel shape that is flexible enough to insert inside the vagina; it is made of 100% medical grade silicone to collect period flow instead of absorbing it and is reusable.