The Hello Cup Small / Medium is the ‘one size fits most’ size. This cup is also suited for physically active users.
The Hello Cup is:
The diameter of the S/M is 41mm and the overall length, including the toggle, is 59mm. It holds 21mls (to the holes) - this is more than tampons.
To help determine your size, you can take a size quiz here.
The colour of the S/M Hello Cup is blue.