How to Wash Period Underwear (Without Ruining Them)

Once you’ve made the switch to period underwear, there’s no going back. But if you’re asking "how do I wash period underwear without messing them up?" - you’re not alone. The good news? It’s actually super simple, and once you get into the groove, it’s a total doddle.

Whether you’re a new convert or just looking to prolong the life of your fave pair, this guide will break down everything you need to know about how to wash period underwear properly—no stress, no stink, no leaks.

Why Washing Them Right Matters

Period undies aren’t your average underwear. They’re made with smart multi-layered technology that absorbs menstrual flow while keeping you dry. But that leak-proof magic? It works much better and lasts longer if you treat them right.

Using overly harsh detergent or chucking them in the tumble dryer can shorten their life or ruin the absorbent parts. Proper care keeps them working better, longer - saving you money and reducing waste (Hello, eco-queen)!

The Simple 3-Step Period Underwear Wash Routine

1. Rinse ASAP

Right after use, give your menstrual underwear a good rinse in cold water. This helps remove most of the period blood and prevents staining or odours.

• Pro tip: Don’t use hot water—it binds the proteins in your fluid to the fabric and can set stains.

• Rinse until the water runs mostly clear.

2. Machine or Hand Wash (Your Choice)

After rinsing, you’ve got two solid options:

Machine Wash:

• If you have one, toss them into a mesh laundry bag or delicates bag to protect the fabric.

• Wash on a cold, delicate cycle using a gentle laundry liquid.

• Skip the fabric softener and bleach, as they can mess with absorbent fibers.

Hand Wash:

• Use mild detergent and gently scrub them in cold or lukewarm water.

• Rinse thoroughly to get rid of all soap residue.

3. Air Dry, Always

This part’s crucial: do not tumble dry. High temperatures can damage the elastic fibers and the Leak-Absorbing Technology inside.

• Lay them flat or line dry on a drying rack (ideally in indirect sunlight).

• Avoid radiators or heaters.

Give them a bit of time - air drying might take longer, but your period undies will thank you.

What to Avoid

To keep your period underwear in top shape, here’s what not to do:

❌ No fabric softener (it coats and clogs absorbent fibres)

❌ No bleach (too harsh and breaks down fibres)

❌ No ironing (truly not necessary)

❌ No wringing aggressively (just press gently to remove excess water)

❌ No dryer sheets (they can leave residue on the absorbent parts)

How Often Should You Wash Period Underwear?

Every time you wear them. Think of them like your regular undies—but better. After each use, rinse and wash to prevent bacteria and odours from building up.

Have a few of our bestselling pairs on rotation to make your period week smooth and stress-free. We recommend at least 3–5 pairs depending on your flow.

Storing Period Underwear Between Cycles

Once dry, store them in a clean, dry drawer—just like your other underwear. If you want to go the extra mile, you can store them in a breathable fabric pouch or wet bag (like our waterproof wet bag) to keep them fresh and ready for action.

How Long Do Period Underwear Last?

With proper care, high-quality menstrual panties like those from Fri Period can last up to 2+ years. That’s over 24 cycles and more than 300 disposable pads or tampons you didn’t send to landfill. Pretty amazing, right?

Wrap-Up: Show Your Period Undies Some Love

Knowing how to wash period underwear the right way means they’ll stay comfy, effective, and fresh - cycle after cycle. It’s a small act of self-care that makes a big difference for your intimate well-being, your wallet, and the planet.

So go ahead—rinse, wash, air dry, repeat. 💞

FAQs

1. Can I put period underwear in the dryer if it’s on low heat?
We don’t recommend it—even low heat can affect the absorbency and elasticity over time.

2. Do I have to wash them right away after wearing?
It’s best to rinse them ASAP. If you’re out, store them in a waterproof bag and rinse when you get home.

3. Can I wash period underwear with other clothes?
Yes, as long as you’ve rinsed them first and use cold water with a gentle cycle.

4. What kind of detergent should I use?
Choose a mild, fragrance-free laundry liquid with no added softeners or enzymes.

5. How do I know when it’s time to replace them?
If they’re not absorbing like they used to or show signs of wear and tear, it might be time for a fresh pair.

Want to build your stash?

Check out our bestselling pairs: Classic Period Brief | Period Boxers | Period Hipsters

Because caring for your period starts with caring for what you wear.