Regular price

everyday bikini

Regular price Sale price $25 USD
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Regular price

everyday bikini

Regular price Sale price $25 USD

Buy 3+ and save 20%

super-light Absorbency holds up to 1 light tampon

Color Black
HSA/FSA Approved

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The Leak-Resistant Everyday Bikini Period Underwear pairs invisible protection with a classic low-rise cut. The ultra-soft, stretchy fabric hugs the body, while seamless edges minimize panty lines. The absorbent core acts as an alternative to a panty liner, making it perfect for light days (or any time of the month). It's where a comfortable, everyday staple meets leak-resistant protection.


Absorbs light spotting, sweat, and discharge Features a low-rise cut with seamless edges Can be used as a panty liner alternative or to back up a tampon or cup Washer friendly, hang to dry


Outer: 75% Nylon 25% Spandex 
Top Lining: 100% Cotton
Interlining: 95% Cotton 5% Spandex
Bottom Lining: 100% Polyester

Care Instructions:
Reusable & machine washable: When you're done wearing, simply wash with cold water and gentle detergent, then hang or lay flat to dry


Absorbent Zone; Regular
Center lining protection with absorbent multi-layer core

  • moisture-wicking top layer
  • absorbent core
  • waterproof liner
  • 4-way stretch outer fabric
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What is bikini style underwear?

The bikini undies by Proof feature a mid-rise fit, high cut leg opening, and moderate booty coverage, all in a comfortable stretch fabric that moves with your body.

What is the difference between brief and bikini underwear?

The bikini features a high-leg opening and narrow sides, with a mid-rise and moderate back coverage. The brief is designed with wider sides, lower rise, and moderate back coverage.

Is this underwear environmentally friendly?

Proof undies are designed to be better for you, and the environment! Single-use plastic period products like tampons and pads end up in landfills and oceans, where they pose a serious threat to wildlife. By switching to Proof, you help to reduce single-use plastic waste.

Do I need panty liners to wear with these undies?

No you don’t! Our underwear comes in varying absorbencies, ranging from super-light to super-heavy –– holding up to 5 regular tampons or 10 teaspoons. The built-in lining increases in coverage from lightest to heaviest. You can, of course, wear a panty liner with any of our leak-proof underwear, but it is not necessary.

What type of leaks are these undies best for?

Our leak-proof underwear is super absorbent, moisture-wicking, and comfortable for a wide range of leaks, including periods, bladder leaks, incontinence, after sex, maternity, postpartum, and sweat.

Is this underwear moisture wicking and odor resistant?

Yes! Our underwear is both moisture wicking and odor resistant to keep you ultra dry and worry-free. Our unique interlock lining wicks away moisture to help keep you feeling dry, and antimicrobial fibers inhibit the growth of bacteria and decrease odor.

How to choose the size right for you

Your hip and waist measurements are the most important size when finding the perfect fit. If your measurements fall into different size categories, your hip measurement will be most accurate. Follow our size guide to match your measurements with the right size listed on the chart.

Is this leak proof underwear available in plus sizes?

Yes, all our styles of leak-proof underwear are available through 3XL. Proof offers plus size period underwear in the following measurements:

  • XL — US size 16–18 with 44–47" hips and 34–37" waist
  • 2XL — US size 20–22 with 47–50" hips and 37–40" waist
  • 3XL — US size 24–26 with 50–54" hips and 40–44" waist

Can I sleep while wearing these undies?

Yes, you can absolutely wear our leak-proof undies overnight. They are safer and more comfortable than tampons, pads, and cups.