Shelly Swim Shells box with beige swim patches
Shelly Swim Shells box with black swim patches
Swim Shell size 7.7 x 2.9 in (19.7 x 7.4 cm): soft fabric, water-resistant adhesive, easy-peel backing
Season Pass: three boxes of Shelly Swim Shells
Water beading on a Swim Shell stuck to pool tiles
Taking a Swim Shell out of the box
Friends laughing at the pool
Shelly Swim Club

Swim Shells

Soft, discreet swim patches that stay put in the water

  • Stays put in pool, lake & ocean water
  • Smooth, covered look under any swimsuit
  • Soft, skin-friendly fabric – no insertion
  • Extra peace of mind on period days
Color: Beige

Pick your pass

Your free gifts 2/3 unlocked

Free
Free US shippingOn every order
Nipple Covers (5 pairs) Free
Nipple Covers (5 pairs)$12.95 valueUnlock with Season Pass
$15 Cashback Free
$15 CashbackOn your next orderUnlock with Summer Pass

60-day money-back guarantee

Love it or get every cent back. No awkward questions.

Shelly in action

The pool bag essential
Apply in 30 seconds
Period on vacation? Still swimming.
Free tracked & insured shipping
60-day money-back guarantee
Plain, discreet packaging
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What’s in the box

10 Swim Shells per box in your chosen shade (Beige or Black) – choose 2, 3 or 6 boxes. Season Pass and Summer Pass include 5 pairs of free nipple covers in your shade. The Summer Pass also gets you $15 cashback on your next order (sent by email as a code). Size: 7.7 × 2.9 in (19.7 × 7.4 cm). Packaging may vary.

How to use

1. Start with clean, dry skin.
2. Peel off the backing and press the Shell onto your intimate area, wide end at the front.
3. Smooth the edges, put on your swimsuit and go.
4. After swimming, peel it off slowly. Single use.

Materials & safety

Soft, flexible non-woven fabric with a water-resistant adhesive. If you have sensitive skin, try a small piece first and stop use if irritation occurs. Shelly is a hygiene and comfort product, not a medical device and not a replacement for period protection.

Shipping & returns

Free US shipping on every order, with tracking and insurance. Most orders arrive within about 8 business days (6–10). Ships in plain, discreet packaging. Covered by our 60-day money-back guarantee.

Swim Shells
Beige · 3 Boxes (30 Shells)
Stays put in the water Smooth look under any swimsuit No insertion Beige & Black Soft, skin-friendly fabric

The problem nobody talks about

Swim days come with what-ifs.

Germs in the water, period days, a pool full of strangers – and suddenly you’re the one staying on the sun lounger.

Germs & UTIs

Lakes, pools and hot tubs carry bacteria – and your most sensitive skin sits right in the water.

Period days

Even with a tampon or cup, the “what if” keeps you out of the water.

Pools & hot tubs

Splashing, sliding, sitting on the pool edge – you want to feel covered, not self-conscious.

Meet your swim-day secret weapon ↓

The research

What nobody tells you about swimming

Pools, lakes and hot tubs are not as clean as they look – and your most sensitive skin is right in the middle of it.

UTIs

50%+

of women get at least one UTI in their lifetime

And about 1 in 4 of them will have it come back. If you are prone to UTIs, it pays to be picky about what touches your most sensitive skin.

Source: Clinical Infectious Diseases, 2025

Lakes

2.1x

higher odds of a drug-resistant UTI linked to lake swimming

In a case-control study, swimming in freshwater in the past year was linked to about twice the odds of a UTI caused by drug-resistant bacteria.

Source: Søraas et al., PLOS ONE, 2013

Pools

1 in 8

public pool inspections led to an immediate closure

In a CDC review of 84,000+ routine inspections, 1 in 8 found violations serious enough to shut the pool down on the spot.

Source: CDC, MMWR Surveillance Summary, 2016

Hot tubs

27,000+

illnesses linked to pools & hot tubs

CDC counted 493 outbreaks from treated swimming water (2000–2014). Hotels were the #1 setting, and hot tubs were behind 41% of hotel outbreaks.

Source: CDC, 2018

Chlorine

30%

of pool owners admit they have peed in the pool

Pee and sweat react with chlorine and form irritants called chloramines – the real reason behind red eyes and itchy skin after a swim.

Source: Water Quality & Health Council survey, 2020

Periods

49%

of teen girls skip swimming on their period

Nearly half said they avoid the water altogether when they are on their period – instead of using something made for swimming.

Source: Luna app poll of teen girls

Shelly is a hygiene and comfort product, not a medical device, and it is not proven to prevent infections. It adds a soft, water-resistant layer between your most sensitive skin and the water. If you get frequent UTIs or infections, talk to your doctor.

Get your Swim Shells

Shelly Swim Club

Pool Rules

  1. 1
    No sitting out.

    Pool party, hot tub or girls’ trip – Shelly keeps you covered and confident.

  2. 2
    Clean & dry, then apply.

    Peel off the backing, press it on, smooth the edges.

  3. 3
    Period day? Team up.

    Pair your Shell with a tampon or cup for an extra layer of peace of mind.

  4. 4
    Peel slowly after swimming.

    Gently and in the direction of hair growth – no fuss.

  5. 5
    One Shell, one splash.

    Single use. Toss it and dive back in.

By order of the lifeguard

Water beading on a Swim Shell stuck to pool tiles Water rolls right off

Made for the water

Splash it. It stays put.

Every Shell is a soft, flexible fabric patch with a water-resistant adhesive. It hugs your curves, moves with you and stays smooth under your suit – from the first cannonball to the last sunset swim.

  • Water-resistant adhesive that stays put
  • Soft, flexible fabric – moves with you
  • No insertion – sits on the outside
  • Peels off easily after your swim
Get your Shells
Swim Shell size 7.7 x 2.9 in (19.7 x 7.4 cm): soft fabric, water-resistant adhesive, easy-peel backing

What makes a Shell

Soft on you. Tough on splashes.

One soft, flexible patch, shaped to fit. 7.7 × 2.9 in (19.7 × 7.4 cm).

  • Soft, skin-friendly non-woven fabric
  • Water-resistant adhesive
  • Smooth look under swimwear
  • Easy-peel backing

Why Shelly

Finally, something made for swim days.

Shelly Pantyliner Period swimwear
Made to stay put in the water
Works with any swimsuit you own
Smooth look under light swimwear
Nothing to rinse or wash after
Fits in your pocket
For every swim day, not just period days

Where to wear it

Made for every kind of splash.

Pools
Ocean
Lakes
Hot tubs
Water parks
Beach days

Zero risk

Welcome to the club.

Every order comes with full Swim Club perks – including our 60-day money-back guarantee: love it or get every cent back.

  • 60-day money-back guarantee
  • Free US shipping on every order
  • Tracked, insured & discreet shipping
  • Member-only summer offers
Join the club

FAQ

Questions? We've got you.

What exactly is a Swim Shell?

A soft, flexible fabric patch with a water-resistant adhesive. You stick it on the outside, over your intimate area, before you put on your swimsuit. It stays put in the water and gives you a smooth, covered look. Size: 7.7 × 2.9 in (19.7 × 7.4 cm).

Can I wear it on my period?

Yes – as an extra layer together with your tampon or cup. A Swim Shell is not a replacement for period protection.

How long does it stay on?

It’s made to stay put through a pool or beach session. For the best fit, use a fresh Shell for every swim.

Beige or Black?

Beige blends in under light and skin-tone swimwear, Black disappears under dark suits.

Does it hurt to take off?

No. Peel it off slowly, ideally in the direction of hair growth. Warm water helps.

Do I need to shave?

Less hair means better hold. Trimmed or shaved works best.

Is it safe for sensitive skin?

Shells are made from a soft, skin-friendly fabric. If you have very sensitive skin, try a small piece first. Stop using it if you notice irritation, and talk to your doctor if you’re pregnant or have a medical condition.

Is Shelly a medical device?

No. Shelly is a hygiene and comfort product. It isn’t intended to diagnose, treat, cure or prevent any disease.

How long does shipping take?

Most orders arrive within about 8 business days (6–10). Every order ships for free with tracking and insurance, in plain, discreet packaging – nobody can tell what’s inside.

What if I don’t love it?

You’re covered by our 60-day money-back guarantee. If Shelly isn’t for you, contact us within 60 days and we’ll refund your order.