Rinse in cold water after use, then wash gently (by hand or on a cold cycle) without bleach or fabric softener, and always air dry.
Rotate a few pairs so you always have clean underwear ready during your cycle.
Change depending on flow: light (all day), medium (6–8 hours), heavy (more frequently or as backup).
Store used pairs in a breathable or waterproof pouch when you’re out.
With proper care, period underwear can last for years and reduce waste.
You've finally made this exciting choice to switch to sustainable period products — go you! Your new period underwear just arrived at your doorstep, and now you're probably wondering what to do next. This guide covers how to wash period pants properly and how to make them last as long as possible.
How to wash period pants (step-by-step guide)
If you follow these steps, your period pants will stay absorbent, fresh, and long-lasting.
1. Rinse in cold water Do this right after wearing. Cold water helps remove blood before it sets, while hot water can lock stains into the fabric.
2. Wash by hand or on a delicate cold cycle Both options work well. If using a washing machine, placing them in a mesh laundry bag helps protect the fabric.
3. Use a gentle detergent Avoid bleach and fabric softener. These can damage the absorbent and leak-proof layers, reducing performance over time.
4. Air dry only Skip the tumble dryer. Heat can break down the materials — air drying keeps them in good condition for longer.
5. Reuse and rotate Once dry, they’re ready to wear again. Having a few pairs in rotation makes your routine much easier.
Pro tip from Ruby Cup: It might be handy to have a few pairs of period underwear on rotation so you're always covered while others are drying. Life = simplified!
First-time user mistakes to avoid
Starting with period underwear is simple, but a few small habits can make a big difference in how well they perform and how long they last. Here are the most common first-time mistakes to avoid:
Rinsing with hot water Hot water can set blood stains into the fabric. Always rinse with cold water straight after use.
Using fabric softener or bleach Fabric softener coats the absorbent layers and reduces effectiveness. Bleach can damage the leak-proof layer.
Tumble drying your period pants Heat reduces lifespan. Air drying is always best.
Wearing them too long on heavier days Learn your flow — on heavy days, change more frequently or use as backup.
Not having enough pairs in rotation One or two pairs usually isn’t enough for a full cycle.
Leaving them damp for too long This can cause odours and reduce freshness.
How to store them during the day
If you’re out and need to change:
Fold them inward to contain moisture
Store in a small waterproof pouch
Rinse when you get home
Avoid sealing them wet for too long — breathable storage is best.
How many pairs do I actually need?
This depends on your flow, how often you wash, and how quickly your underwear dries. Most people find that a small rotation is enough to make things easy and stress-free.
2–3 pairs: works if you wash frequently and mainly use them as backup alongside a menstrual cup 3–5 pairs: comfortable everyday rotation for most flows 5+ pairs: ideal if you prefer fewer laundry cycles or full-cycle coverage
On heavier days or while you’re still learning your flow, having a couple of extra pairs can make things easier.
The goal isn’t to buy more — it’s simply to have enough that your routine feels easy and reliable throughout your cycle.
How often should you change them?
How long you can wear period underwear depends on your flow and the absorbency level of the pair you’re using.
Light days: up to a full day (especially higher absorbency styles) Medium flow: every 6–8 hours Heavy flow: use as backup or change more frequently
Over time, you’ll learn what feels right for your body.
How to remove stains (if needed)
If staining happens, don’t worry.
Try:
Soaking in cold water for a few hours
Using a gentle stain remover
Washing as usual afterward
Avoid harsh chemicals, which can damage the fabric.
Why proper care matters
With the right care, period underwear can last for years while maintaining performance. That means fewer disposables, less waste, and better value over time.
Yes! Period pants can be safely machine-washed on a cold, delicate cycle with a mild detergent. Avoid fabric softener, bleach, and heat, as they can damage the absorbent layers.
How do you wash period pants properly?
Rinse them in cold water after use, then wash on a cold, gentle cycle with mild detergent. Always air dry, never tumble dry.
Do you need to rinse period pants before washing?
Yes. Rinsing in cold water helps remove blood before it sets into the fabric and keeps them fresher for washing.
Can you put period pants in the dryer?
No, tumble drying can damage the leak-proof and absorbent layers. Always air dry to maintain performance and longevity.
What detergent should you use for period underwear?
Use a mild, fragrance-free detergent. Avoid bleach and fabric softener, as they can reduce absorbency over time.
How often should you wash period pants?
You should wash them after each use. Rinse them first, then wash them as part of your regular laundry cycle.
How long do period pants last if you wash them correctly?
With proper care, period pants can last for several years while maintaining absorbency and leak protection.
Can period pants lose absorbency over time?
Yes — but usually only if they are washed incorrectly (e.g. hot water, fabric softener, or tumble drying). Proper care preserves performance.
Are period pants enough on their own?
Yes, period pants are enough on their own for many people, especially on light to medium flow days.
They’re designed to be worn as standalone protection, but on heavier days you may prefer to change them more often or use them as backup for extra confidence.
You can explore our full range of period pants to find the absorbency that suits your flow.
