How do I know which size to choose?Updated a year ago

It will also depend on your flow, but you may find it useful to have a pack containing the different sizes to use at different times of your period:

• The panty liners are for your light flow days or to combine with the cup.
• The day pads are for normal flows that are not extremely heavy.
• The night pad is ideal for your heavy flow days or to sleep all night without leakage.