Once the cup is positioned as low as it will comfortably sit, the end of the stem should sit just inside your vagina.

If you find that, when positioned correctly, the MCUK is uncomfortable when sitting or walking, or pinches the vaginal opening, then you probably need to trim the stem a little bit at a time.

Vaginal length varies, so the stem of the MCUK menstrual cup is designed to be trimmed if needed.

Make sure you feel confident with the position and the removal of your cup before trimming the stem. Practice removing your Mooncup without using the stem before trimming it (see Where do I position my MCUK? and How do I remove my MCUK?). Some users find that they need to remove the stem completely.