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  • Bikini bottom - Indira

    Bikini bottom - Indira

    €44 €55
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  • Bikini bottom - Sirena

    Bikini bottom - Sirena

    €44 €55
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  • Mid-rise waist bikini bottom - Calypso

    Mid-rise waist bikini bottom - Calypso

    €44 €55
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  • Triangle top - Gaia

    Triangle top - Gaia

    €35 €44
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  • One piece swimwear - Kaia

    One piece swimwear - Kaia

    €79 €95
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(32 reviews)

Mid-rise waist bikini bottom - Calypso

Average flow

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Free delivery on orders over €79

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Description

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A period swimsuit designed to never compromise on style, even during your period.

Our bottoms run small; please choose one size up from your usual size. Consult our size guide to choose the size that fits you best.

Why you'll love it:

  • Eco-responsible swimsuit made from recycled fishing nets
  • Ultra-flattering cut that enhances your silhouette.
  • The look of a classic bikini, with ultra-discreet protection. No more compromising on style.
  • Ultra-discreet menstrual protection for light to medium flow (equivalent to 2 to 4 tampons).
  • 3-layer leak-proof technology: absorbent, antibacterial, and waterproof.
  • Wear it high-waisted or low on the hips as you like.
  • Soft, thin, quick-drying fabric.
  • Does not swell in water.
  • The Sirena Brazilian cut has adjustable coverage front and back.
  • Jewelry is chlorine and seawater resistant, and does not heat up in the sun.

Size guide

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Materials & care tips

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MATERIALS

  • Composition: 80% ECONYL® Nylon / Recycled polyester, 20% Elastane, OEKO-TEX certified (free from harmful substances)

CARE INSTRUCTIONS

To preserve its quality over time, we recommend that you:

  • Rinse your swimsuit in cold water after each use to remove excess flow
  • Machine wash at 30°C, without fabric softener, to preserve the effectiveness of the absorbent layers
  • Remove any charms before washing to keep them safe
  • Rinse the charms with clear water
  • Let it air dry, preferably flat and in the shade (avoid tumble drying)
  • Avoid prolonged contact with suntan oils and lotions, heavily chlorinated water, or overheated spas/pools
  • Be careful with rough surfaces that could damage the fabric

Shipping & returns

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DELIVERY

  • Free delivery from €79
  • 48-hour delivery in France and 3/5 days in Europe

RETURNS

  • If the size or style isn't right, you have 30 days to request an exchange or a refund.
  • For refunds, once we receive the swimsuit, we will issue your refund within 48 hours.
  •  To make a return 💌: Please send us an email at contact@naia-swim.com specifying: your name and order number, your choice: an exchange (desired style and size) or a refund

Customer review

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Audrey E.

The after-sales service is great, very quick response, very responsive and very accommodating.
I tried the bikini bottom for a whole day and I am super happy, I was able to swim without worrying about having to find a restroom to change. I really recommend it

August 18, 2026

The complete set:

Triangle top - Gaia

Gaia Top

€35 €44
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How does it work? 

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Beautiful, free and confident

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You say it better than we do

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Need help choosing your size?

We are here to answer your questions Monday to Friday from 8 a.m. to 5 p.m. and Saturday from 9 a.m. to 12 p.m.

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FAQ

How does the swimsuit not leak in the water?

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Our swimwear uses multilayer absorbent technology, with an invisible leak-proof membrane. It holds the flow even underwater so you can swim, move, and enjoy the water with complete peace of mind.

How long can I wear my jersey without changing it?

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Our bikini bottoms effectively absorb your flow for 5 hours (equivalent to 3 tampons). For optimal comfort, having a second pair on hand to stay dry is the best!

How do I use it?

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After each use, rinse your swimsuit in cold water to remove excess flow. You can then machine wash it at 30°C, without fabric softener to preserve the effectiveness of the absorbent layers. Let it air dry, preferably flat, so it keeps its shape (avoid the tumble dryer).

Can I wear it with a heavy flow?

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All our models absorb the equivalent of 3 tampons (5 hours of dryness), depending on the intensity of your flow. For heavier flows, we recommend changing it a little sooner to stay dry and comfortable.

Can I swim, move, and play sports?

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Our bikinis are designed to follow you in all your movements, at the beach or in the water. Comfortable and well fitted, they allow you to enjoy swimming and moving with complete freedom.

Returns and exchanges: 30 days to change your mind

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  • At Naia Swim, we know that buying a period swimsuit online is not always easy. That is why we accept exchanges and refunds within 30 days of receiving your order.
  • Please send us an email at contact@naia-swim.com specifying your name and order number, and whether you would like an exchange (specifying the desired model and size) or a refund.
  • 5 stars: 1 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
Y
Yasmina CLEMENT
16/07/2026

Je ne savais même pas que les maillots de bain menstruels existaient… et pourtant, j'ai adopté le concept dès le premier essayage !

Ce que j'aime avec Naïa Swim, c'est qu'on a enfin un maillot à la fois tendance, élégant et protecteur. On sent la qualité des matières et tout le travail de recherche qu'il y a derrière chaque modèle.

Mon coup de cœur est que c'est impossible de deviner qu'il s'agit d'un maillot menstruel. Je peux le porter à la plage ou à la piscine à n'importe quel moment, sans qu'il ait l'air "spécial". C'est à la fois discret, confortable et rassurant.

J'adore aussi les bijoux de maillot interchangeables qui permettent de personnaliser son look. Une marque que je recommande !