Heavy flow

Fanny — Period Underwear · Heavy Flow

Regular price$36.90
/

From $29.15 for 5 ✨

Absorbs up to 40 ml — equivalent to 4 super tampons

OEKO-TEX Std 100 Class II · GOTS organic cotton lining

Size
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Ships within 48 hours Free shipping over $60 Free exchanges · Refunds less $5 return shipping
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Save more with volume pricing

The more you buy, the lower the price

2 pairs $34.90 each
3 pairs $33.30 each
4 pairs $32.90 each
5 pairs $29.15 -21% ✨

* Applied automatically at checkout · Mix sizes & styles

💡 Tip: Mix sizes & styles in your cart — the volume discount applies to your total.

  • Invisible
  • Leak-proof
Independently
lab-tested
OEKO-TEX Standard 100
OEKO-TEX
Std 100
Organic cotton
lining
Unretouched
photos
Recyclable
packaging
Audited
workshops

Why you'll love it

12h protection

40 ml — 4 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

Full coverage, double absorption, and a dotted mesh that makes it feel like lingerie rather than protection.

Fanny sits at a mid-rise waist — not high, not low — and the absorbent panel runs almost the entire length of the brief, front to back. That's what lets it hold 40 ml, the equivalent of 4 tampons, without ever feeling bulky.

This is the style to reach for on your heaviest days, or overnight when you don't want to think about turning over. The coverage does the work.

The outer fabric is a fine dotted mesh — plumetis, the same detail you'd find on French lingerie.

Available in sizes XXS to 3XL. Our models wear XS, M and 2XL.

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 sizeUS sizeHip (in)Hip (cm)
XXS031–32.579–83
XS233–34.584–88
S435–36.589–93
M637–38.594–98
L839–40.599–103
XL1041–42.5104–108
2XL1243–45109–114
3XL1445.5–47115–120

Our underwear fits true to size. If in doubt, measure at the fullest point.

Which style for your flow?

Very heavy

Mathilde

Heavy+

Liv

you are here

Heavy

Fanny

Medium

Margot, Ella, Gaby

Light

Very light

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 40 ml — equivalent to 4 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

  • ★★★★★

    This is the first time I've bought this kind of underwear and today is the first time I've worn them — honestly, they're perfect. You feel light, you don't feel any protection the way you do with regular pads, and I think they look good. Really, I'm very happy. I've ordered two more.

    Linda T. · 07/25/2026 · Translated from French

  • ★★★★★

    Game-changing

    Extremely comfortable and very absorbent, even with a very heavy flow. I don't even need to change overnight! A revolution.

    Nelly A. · 10/11/2025 · Translated from French

  • ★★★★★

    I love them

    No bulky diaper feeling, especially when you move — you can't hear the fabric! You feel confident going out, or overnight.

    Thu Q.W. · 10/25/2025 · Translated from French

  • ★★★★★

    Excellent product

    Great product! I really recommend it to any woman who wants to feel at ease in her body.

    Marie D. · 10/15/2025 · Translated from French

  • ★★★★★

    Really pleasant to wear and they work!! Sizing is spot on.

    Robin I. · 05/26/2026 · Translated from French

  • ★★★★☆

    Pretty, but…

    Pretty pair. I took an S but I find it runs smaller than the others. Shame.

    Anne-Sophie A. · 07/23/2025 · Translated from French

Buy more, pay less

−21% from 5 items · mix sizes & styles
The more you buy, the less you pay