menstrual Cup?

Li
Who all uses the cup? Never hear of it till now?.. they say it's best to use since pads and tampons have chemical from the cotton. 
Definition: 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). ... Unlike tampons and pads, the cupcollects menstrual fluid rather than absorbing it.