Flow & Products
Choosing the right pad size for each day
How to match pad length to your flow and your day — and how to use the four PIAX sizes, from light days to overnight.
Key takeaways
- Longer pads give more coverage; shorter pads are lighter for everyday moving around.
- Your flow changes across your period, so most people use two sizes.
- Match the size to your flow, your activity and the time of day.
- Not sure? A mixed pack lets you try sizes before buying a full box.
1. How to think about pad size
Pad length is mostly about coverage — how much area the pad protects. Three things help you choose:
- Your flow: heavier days need more coverage.
- Your position: lying down at night moves flow towards the back, so longer is better.
- Your activity: a long school or work day without many breaks may need more coverage than a short outing.
2. The four PIAX sizes
- PIAX VERA — 240mm: lighter days and the start or end of your period.
- PIAX LUMA — 290mm: regular, everyday flow.
- PIAX NOCTE — 330mm: heavier days and nights.
- PIAX SEREN — 360mm: more coverage overnight.
3. Most people use more than one size
Your flow changes over your period — often heavier in the first 2 days, then lighter. That is why many people keep two sizes at home: one for the day and a longer one for heavier days or nights.
- Step 1Heavy days 1–2: a longer pad, especially at night
- Step 2Middle days: your regular size
- Step 3Last light days: a shorter pad
- Step 4Every night: a longer pad for back coverage
4. Signs you need a different size
- Leaks at the back, especially at night: try a longer size.
- Leaks at the front or sides: try a longer size or reposition the pad.
- The pad feels bulky on light days: try a shorter size.
- You need to change every 2 hours with your longest pad: talk to a doctor, as your periods may be heavy.
5. Not sure? Start small
The 15-pad PIAX Cycle Pack lets you try several sizes in one box before you buy a full box of one. You can also take the Find My Pad quiz for a personal suggestion based on your flow and day.
Length is about coverage. Choose what feels comfortable for you.
6. FAQs
Sources & further reading
This article is general information, not medical advice. For diagnosis or treatment, please speak to a qualified healthcare professional. In an emergency, call 112.
