Seamless period underwear: invisible even under leggings

Q: What certification do the fabrics have?

All our fabrics are certified OEKO-TEX® Standard 100 and tested PFAS-free to guarantee the absence of harmful substances.

Forget you’re even wearing protection thanks to our second-skin technology. Our seamless period panties are completely invisible under the most fitted clothes, even sports leggings.

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

culotte menstruelle pas cher sans couture

Gaby - Invisible medium-flow period panty

XXS XS S M L XL XXL XXXL

Margot – Medium flow period underwear +++

XS S M L XL XXL XXXL

Mia – Light-flow period brief

XS S M L XL

They offer up to 12 hours of protection with no visible lines, from medium to very heavy flow.

Why choose seamless period underwear?

Seamless period underwear is ideal for active women looking for invisible, high-performance protection. Thanks to laser cutting and bonded seams, there are no thick edges.

The result: zero visible lines on your buttocks, even under sports leggings, skinny jeans or a bodycon dress. Unlike traditional protection, it combines total discretion, perfect support and fabrics certified free from harmful substances.

Our must-have styles for absolute discretion

Liv: Our most high-performance style for very heavy flow. It absorbs the equivalent of 4 to 5 tampons while remaining thin and totally invisible. This is Louloucup’s technical feat: maximum security, minimal panty lines.
Gaby: The invisible everyday style for medium flow: simple, soft and effective.
Margot: A chic high-waisted cut with a certified organic cotton lining for natural comfort.
Mia: Ideal for light flow, spotting and the end of your cycle. Invisible thanks to its ultra-flat lace.

Performance, sport and certified fabrics

Our entire seamless range is made from fabrics certified to OEKO-TEX® Standard 100 and tested PFAS- and nanoparticle-free. It’s particularly suitable for busy days, workouts and teenagers (Liv is available from XXS).

Need a more high-cut, invisible style? 👉 Discover our menstrual thong.
Looking for a 100% organic cotton style? 👉 Explore our light and medium-flow collection.
Need maximum protection at night and for hemorrhagic flow? 👉 Discover our heavy-flow collection.

Seamless Period Panties FAQ

Is seamless period underwear really invisible?

Yes. Thanks to its laser-cut finish and the absence of thick elastics, it doesn’t create any extra bulk under clothing.

Is the Liv panty suitable for very heavy flow?

Yes. It absorbs the equivalent of 4 to 5 tampons and is designed for very heavy flows, including long days.

What certification do the fabrics have?

All our fabrics are certified OEKO-TEX® Standard 100 and tested PFAS-free to guarantee the absence of harmful substances.

How do I care for a seamless panty?

Rinse it in cold water after use, machine-wash at 30°C without fabric softener, then air-dry. Avoid the tumble dryer to preserve the heat-bonded seams.

What’s the difference between seamless and invisible underwear?

“Seamless” refers to the manufacturing technique (laser cutting, bonded seams), while “invisible” describes the result: no visible lines under clothing. At Louloucup, our seamless underwear is therefore, by definition, invisible.

Is seamless period underwear suitable for sports?

Absolutely. The absence of thick seams prevents chafing during exercise. Styles like Liv and Gaby are particularly suitable for yoga, Pilates, running and dance thanks to their flat finish and secure fit.

Is the seamless period underwear suitable for heavy flow?

Yes. The Liv style is designed for very heavy flow with an absorption equivalent to 4–5 tampons. Despite this high capacity, it remains very thin (around 3 mm).

How many hours can you wear seamless period underwear?

Depending on the style and the intensity of your flow, you can wear Louloucup seamless underwear for between 8 and 12 hours. On very long days, simply change into a fresh pair halfway through.