Regular price

Leakproof Thong

Regular price Sale price $25 USD
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Regular price

Leakproof Thong

Regular price Sale price $25 USD

Buy 3+ and save 20%

light Absorbency holds up to 1 regular tampon

Color Sand
HSA/FSA Approved

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A mid-rise style with minimal coverage, our Leakproof Thong Period Underwear is a style you know and love, expertly designed to have your back for light periods and spotting. So comfortable, you'll forget you're even wearing it (because we know you don't want to skip your workout class). Crafted with our Leak-Loc® absorbent core technology that helps you feel confident.


Absorbs light periods, spotting, sweat, and discharge

Features minimal coverage that’s invisible under clothing

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% Polyester
Interlining: 70% Polyester 30% Cotton
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
Leak-Loc® bonded edge technology

  • moisture-wicking top layer
  • absorbent core
  • waterproof liner
  • water-resistant outer fabric
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What type of leaks is the Proof Thong best for?

The Thong is equipped with Leak-Loc® technology and light absorbency that holds up to 1 regular tampon or 2 tsp. That makes it perfect for light bladder leaks or periods, spotting, discharge, or sweat. The unique moisture-wicking lining and technical fibers wick moisture away from the body and inhibits the growth of bacteria while fighting odor.

What makes the Proof leakproof thong comfortable?

Our leakproof, period-proof thong was designed with comfort in mind. Created with buttery-soft, stretch fabric that moves with the body and a thin, flexible gusset keeps you comfortable, day or night.

How should a thong fit and what size should I buy?

We typically advise buying your normal underwear size for the thong. For a more generous, high-rise fit, you may like a size up. For more size guidance, check out our size guide.

Can I wear a thong everyday?

Oh yes! The Thong is great for everyday wear, as it provides light ‘back up’ protection for all of those in-between days. Smooth, seamless edges vanish under clothing to provide a sleek look under clothing.

Is the Proof leakproof thong good for light periods?

The leakproof thong undie was designed with light periods in mind. If you have a low flow, the thong will pull moisture away from the body and into the Leak-Loc® core which holds up to 1 regular tampon or 2 tsp.

Can I sleep with the Proof period thong?

Sleep tight, all night long in the Proof period thong. Really, there are no rules regarding what you can and can’t do in this thong. With this breathable and buttery thong featuring leakproof protection you are ready for anything, day or night. Keep in mind though, the Proof period thong has light absorbency which means it holds up to 1 regular tampon or 2 teaspoons of liquid. If you think you’ll need more protection than this, Proof has plenty of other leakproof undies and thongs that offer more absorbency. The Proof period thong is best for sweat, discharge, spotting, light period leaks, and panty liner replacement.

What colors is this thong available in?

The leakproof thong is available in black or sand. These color thongs are a staple to every women’s wardrobe - order both. You won’t regret it.

Is the Proof period thong moisture wicking and sweat resistant?

Yes and yes! Proof really has you covered - if you let them of course. Our leakproof undies are designed with several layers of moisture-wicking, absorbent materials that pull moisture away from the body and into a super absorbent core. They are designed to wick away sweat and moisture whether you're enduring an intense workout and taking an afternoon stroll. All the while, our proprietary technical fibers will be fighting odors too. See what we mean when we say we have you covered?

Can I wear this thong every day even if I’m not on my period?

Proof’s leakproof thong can be worn every day, period or not. Our leakproof thongs can certainly prevent leaks during your period, but it’s designed to do much more. The leakproof thong is great for absorbing sweat, discharge, sweat, or spotting, as well as light period leaks.

Can I wear the Proof period thong while working out?

All of Proof’s leakproof thongs and undies can be worn while working out. In fact, we recommend doing so. Whether you’re on your period or not, the leakproof thong can offer several benefits while working out. It can help absorb sweat while fighting odor, keeping you cool, dry, and focused on your workout.

Do I need to wear pads or tampons with the Proof period thong?

No need. In fact, you can make a big environmental impact by not wearing pads or tampons. Proof leakproof undies are designed to be a reusable alternative to single-use plastics. By eliminating the use of pads and tampons, you can impact the overall well-being of our planet. Tampons, pads, and panty liners are a huge source of waste. On average a single woman disposes of about 11,000 tampons in her lifetime. Each year an estimated 20 billon pads and tampons are thrown into North American landfills. With a lack of oxygen, it’s unlikely that these products will decompose. It could take 800 years for non-recyclable female care products to actually decompose. By wearing Proof leakproof undies you can make a big impact.

How comfortable is the Proof leak resistant thong?

Imagine breathable, buttery soft fabric that makes you feel free. We’ve all (hopefully) had that ahh moment slipping on a dreamy pair of underwear. Now imagine if you could have that same feeling while knowing you can stay dry and confident all day or all night long. It’s empowering. Slip on the leakproof thong and worry about what’s important in life, not your underwear. Besides, it’s so comfortable you’ll probably forget you are even wearing any. The real proof though, is in our reviews