Period panties for heavy flow: leak-free protection

Q: Which period panties are best for heavy or hemorrhagic flow?

Our Clara and Mathilde styles are our champions. With an absorption capacity equivalent to 5 tampons (50 ml), they’re ideal for very heavy flow linked to a copper IUD or postpartum. All our fabrics are OEKO-TEX 100 certified and PFAS-free.

Q: Are your styles suitable for teenagers?

Yes, absolutely. The Mathilde and Jade styles are available from size XXS (EU 32). They offer the same ultra-absorbent technology as our adult models, so you can get through school days or sports without worrying about leaks. The Simone heavy-flow period panty is also available from size 3XS, perfect for pre-teens!

Q: Where are your panties made?

Most of our collections are made in Portugal. For certain technical styles, we work with expert partner workshops located outside Europe. Our top priority is quality: 100% of our fabrics are OEKO-TEX 100 certified and guaranteed PFAS-free.

Louloucup period panties are designed for heavy, very heavy and hemorrhagic flows. They offer up to 12 hours of protection (up to 50 ml, the equivalent of 5 tampons), with a soft, breathable lining in GOTS-certified organic cotton.

Pack of 5 Louloucup period panties – From light to very heavy flow

XS S M L XL XXL

Culotte menstruelle sans couture Liv de Louloucup, flux abondant et invisible sous les vêtements

Culotte menstruelle noire invisible sans couture pour flux abondant

Liv – Seamless period underwear for very heavy flow ++++++

XS S M L XL XXL 3XL

Vue latérale portée de la culotte menstruelle Louloucup Clara, coton bio

Modèle portant la culotte Clara, vue de face, protection menstruelle flux très abondant

Clara - Menstrual panty for extremely heavy flow ++++++

XS S M L XL XXL

Mathilde – Period underwear for very heavy flow ++++++

XS S M L XL XXL XXXL

Jade – Period underwear for very heavy flow ++++++

XS S M L XL XXL XXXL

Culotte menstruelle Léo flux abondant motif léopard en coton bio certifié

Culotte de règles Léo pour flux abondant, imprimé léopard élégant

Leo – menstrual brief for very heavy flow +++++

XS S M L XL XXL 3XL

Culotte menstruelle Fanny de Louloucup, flux abondant avec plumetis

Modèle Fanny par Louloucup, culotte menstruelle élégante pour flux abondant

Fanny – Heavy flow period underwear +++++

XS S M L XL XXL XXXL

Sale

Simone - Very heavy-flow period underwear +++++

Save €6

XS S M L XL XXL

Why is Louloucup the go-to brand for heavy and very heavy flows?

Our technology has been ranked among the best period panties of 2026 par le média 20 Minutes. Recognition that confirms our commitment to performance and women’s health.

Certified capacity
: Certified real absorbency of 40–50 ml (equivalent to 5 tampons), twice the market average.
360° Leak-Proof Technology
: Extended front-to-back protection for 12 hours of peace of mind, ideal for night and sports.
Health & Safety
: Inner layer in organic cotton certified OEKO-TEX, guaranteed PFAS-free, solvent-free and nanoparticle-free.
Conditions & Postpartum
: The go-to protection, approved for postpartum bleeding, copper IUDs, and heavy flows linked to endometriosis or adenomyosis.

Marie’s review (Verified customer):
⭐⭐⭐⭐⭐
"Having endometriosis with hemorrhagic-type flow, this is really the only brand of period panties that holds up. This style is great for sleeping, I’m less afraid of leaking everywhere during the night and even during the day it lasts the whole morning (4/5 hours)."

Ultra-absorbent, leakproof protection

Our heavy-flow styles feature a double absorbent zone and extended front-to-back protection. They hold blood effectively while keeping the skin dry, with no odour or damp feeling. They’ve also been recognized among the 5 best period panties of 2025 by Passeport Santé.

“The best panties for hemorrhagic periods. No leaks in a whole day. My daughter has her life back and so do I. They should be reimbursed by social security!” – Anna (Trustpilot review)

Also discover: Our menstrual swimwear for swimming, our dedicated range for teenagers and our plus-size styles.

Ideal for night-time, postpartum and copper IUD users

Our panties are suitable for heavy periods, bleeding with a copper IUD and postpartum discharge. When lying down, the reinforced absorbent area provides reliable protection, even in case of very heavy flow.

Most of our collections are made in Portugal. Some specific designs that require particular technical expertise are produced in our partner workshops outside Europe. For all our products, we guarantee that our fabrics are OEKO-TEX Standard 100 certified and guaranteed PFAS-free, with no solvents or silver nanoparticles.

Which heavy-flow style should you choose?

Mathilde: Our ultra-comfy, full-coverage shorty. Available from size XXS, it’s also a teen favourite for sports and school.
Liv: Seamless technology, totally invisible under your clothes.
Clara: An elegant high waist offering perfect support, highly appreciated in plus sizes (up to 5XL).
Jade: An ultra-soft organic cotton style, recommended for postpartum or very heavy flow with an IUD.

Heavy-flow period underwear FAQ

Which period panties are best for heavy or hemorrhagic flow?

Our Clara and Mathilde styles are our champions. With an absorption capacity equivalent to 5 tampons (50 ml), they’re ideal for very heavy flow linked to a copper IUD or postpartum. All our fabrics are OEKO-TEX 100 certified and PFAS-free.

Are your styles suitable for teenagers?

Yes, absolutely. The Mathilde and Jade styles are available from size XXS (EU 32). They offer the same ultra-absorbent technology as our adult models, so you can get through school days or sports without worrying about leaks. The Simone heavy-flow period panty is also available from size 3XS, perfect for pre-teens!

Can I build a custom bundle with different flows and styles?

Absolutely! At Louloucup, you can build your own custom box by mixing heavy-flow panties, lighter styles and even a period swimsuit. The more items you add, the lower the price per item!

How long can you wear a Louloucup panty?

You can wear it for up to 12 hours at a time. Our wicking fabrics trap flow and moisture instantly, which prevents odours. For extremely heavy bleeding (over 70 ml), we recommend having a spare pair or using a Louloucup in addition.

Where are your panties made?

Most of our collections are made in Portugal. For certain technical styles, we work with expert partner workshops located outside Europe. Our top priority is quality: 100% of our fabrics are OEKO-TEX 100 certified and guaranteed PFAS-free.

How do I care for my panties so they last a long time?

It’s easy: rinse it in cold water after wearing it, then machine-wash at 30°C (short cycle, no fabric softener). Finally, let it air-dry. Avoid the tumble dryer to preserve the performance of the technical fibres.

Which period underwear should I choose for very heavy flow or a copper IUD?

For hemorrhagic flow, endometriosis, adenomyosis or if you use a copper IUD, our Clara and Mathilde styles are the most suitable: they absorb up to 50 ml (5 tampons) and offer 12 hours of leak-free protection.

For postpartum and the return of your period after birth, the Jade style is particularly recommended for its soft organic cotton and supportive, full-coverage fit.

Can you wear period underwear at night with a very heavy flow?

Yes, absolutely. Our heavy-flow underwear is designed for night-time wear: the 360° leak-proof protection covers the front and back, even when lying down.

The Liv style is particularly recommended for sleeping: seamless, it hugs the body perfectly and stays invisible under clothing. For extremely heavy flow (over 70 ml), you can combine it with a Louloucup menstrual cup for maximum protection.