Someone who uses a menstrual cup
for a period instead of tampons or instead of/with disposable pads. One cup lasts 10+ years, its reusable and most are made with medical grade silicone or a similar material.
Conversion to a cup can be for financial reasons (average savings of ~$200-300/year or ~$2400-$3600 over 10 years),
or environmental (reusable), or for comfort/health (non absorbent/no chemicals)