★★★★★
I've tried several brands and kept leaking, because my flow is heavy. This is the first brand I've been happy with — it holds all day and it's genuinely comfortable. Really, really pleased.
lab-tested
Std 100
lining
photos
packaging
workshops
Why you'll love it
12h protection
60 ml — 5 super tampons
Side leak barriers
Absorbent side walls
Quality & transparency
Certified underwear for your health
OEKO-TEX certified fabrics with GOTS organic cotton lining in direct contact with your skin.
OEKO-TEX Standard 100
Class II
The entire panty is certified. Class II covers textiles in direct skin contact — the strictest safety standard.
Certificate no. 2026OK1834 — issued by AITEX
Organic cotton GOTS
In contact with your skin
The layer touching your skin is made of GOTS certified organic cotton, the most demanding standard in organic textiles. No pesticides, no GMOs.
Our fabrics are safe, organic & certified
We publish the independent lab report — Lab-tested · 25 ppb PFAS detection limit.
Read the report
Shipping & returns
🚚
US — Free shipping
Ships within 48h (Mon–Fri) · Delivered in 3–7 business days
🌍
Canada — Free shipping on orders over $45
5–10 business days
↩️
Returns — 30 days
Unworn, unwashed, in original packaging. Menstrual cups are not returnable.
Description
Our most absorbent style, and the one customers come back for.
Mathilde is high-waisted, which does two things: it holds you in, and it lets the absorbent panel rise higher at the front than any other style we make. Together that's 60 ml of capacity — the equivalent of 5 tampons.
If your flow is heavy enough that you've been doubling up on protection, this is the one. Wear it overnight without setting an alarm. Wear it on day two.
The outer fabric is a fine dotted mesh, cut high on the waist.
Available in sizes XXS to 3XL. Our model wears a size S.
Materials
- Outer: polyamide, elastane, dotted mesh
- Gusset: 95% organic cotton, 5% elastane
- OEKO-TEX® Standard 100 certified — certificate 2026OK1834, issued by AITEX
- Lab-tested · 25 ppb PFAS detection limit
- Designed in France since 2017
Care
Rinse in cold water right after wearing — cold water first, always.
Machine wash at 86°F (30°C) with the rest of your laundry. No fabric softener.
Air dry. Never tumble dry.
Size guide
Measure your hip at the fullest point. Between two sizes, size up.
| Louloucup size | US size | Hip (in) | Hip (cm) |
| XXS | 0 | 31–32.5 | 79–83 |
| XS | 2 | 33–34.5 | 84–88 |
| S | 4 | 35–36.5 | 89–93 |
| M | 6 | 37–38.5 | 94–98 |
| L | 8 | 39–40.5 | 99–103 |
| XL | 10 | 41–42.5 | 104–108 |
| 2XL | 12 | 43–45 | 109–114 |
| 3XL | 14 | 45.5–47 | 115–120 |
Our underwear fits true to size. If in doubt, measure at the fullest point.
Which style for your flow?
Organic cotton on the outside too — all our underwear already has an organic cotton lining
Best-seller
Frequently asked questions
How long can I wear it?
Up to 12 hours for a regular flow, 6–8 hours for a heavy flow. It absorbs up to 60 ml — equivalent to 5 super tampons.
How do I wash it?
Rinse in cold water, then machine wash at 30°C / 86°F. Air dry. Avoid fabric softener and the dryer.
How many pairs do I need?
For a full cycle, we recommend 6–7 pairs: 4–5 to wear + 2–3 rotating while you wash. At 5 pairs you also unlock the maximum discount (-21%)!
How long does a pair last?
With proper care, about 5 years (200+ washes). A solid investment.
What if it doesn't work for me?
Exchange or refund within 30 days if unworn, unwashed, in original packaging. For a product defect: 30 days, even if worn.
What our customers say
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★★★★★
I have endometriosis with a hemorrhagic flow, and this is truly the only brand of period underwear that holds up. This style in particular is great for sleeping — I'm much less worried about waking up to a mess. And during the day it gets me through the morning (4–5 hours).
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★★★★★
Top marks
Pleasantly surprised. I've been looking for ages for underwear where the absorbent panel comes up high enough at the front and the back. Absolutely top of the range — I'm going to order a second set.
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★★★★☆
I'm testing period underwear right now. I was skeptical — very skeptical. I've been pleasantly surprised by the quality. I'll admit I went to work with a change of clothes just in case… but no, no nasty surprises. I'm giving it another cycle or two before I'm fully convinced, since this period wasn't as heavy as they can sometimes be.
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★★★★★
Great product!!
Great buy! It's a real relief to wear something reliable and comfortable. And pretty on top of that!
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★★★★★
Comfortable. This was a first for me and period underwear is so much nicer than pads.
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★★★★★
My daughter loves them: comfortable, pretty, and most importantly — completely reliable!
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