How To Wash Period Pants

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.