Shop Proof Teen Collection

Period proof teen underwear for every flow.

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What makes Proof period underwear different from other period products?

Quick answer? A lot.

Proof underwear are a reusable alternative to single-use plastic disposables like pantyliners, pads, and tampons. Additionally, they are safer than tampons - as Proof undies are not an internal use product - and will not cause Toxic Shock Syndrome. We use only the highest quality materials when constructing our underwear - so you’re covered and comfortable, all day.

Can I use Proof period proof undies every day?

Ohhh yeah. Our lighter absorbency pairs are excellent for every day wear, when you don’t need a higher absorbency to hold your flow, but any pair of Proof will give you peace of mind every day of the month. We recommend The Everyday Undie for every day of the week - smooth, seamless edges disappear beneath clothing, and a super slim lining absorbs discharge, sweat, and spotting to help keep you secure and confident.

Is period underwear safe?

Proof period underwear are one of the most safe period products available. Proof is an external use product, meaning it does not go in the body, like a tampon would. Internal use products like tampons carry the risk of Toxic Shock Syndrome, a rare but serious condition caused by bacterial toxins. Proof period panties remain outside of the body, which decreases the risk of harmful bacterial growth in the body.

What’s more, Proof is designed with high quality materials that have been rigorously tested to ensure your safety. Proof period undies are free of PFOA-PFOs, lead, phthalates, and other harmful chemicals. Our leakproof pairs feature antimicrobial fibers that not only fight odor, but inhibit the growth of bacteria to help keep you healthy and fresh.

Our leakproof technology is woven in - not sprayed on the top lining, like other period undies - so it will never wash out or reabsorb into the body. We are dedicated to providing you with the highest quality care - down there.

Can you wear period underwear all day?

Please do! We designed Proof period underwear in a wide range of absorbencies to suit any flow, from spotting to super heavy periods. To find your absorbency level, gauge your flow based on typical tampon usage on an average day. Helpful tip: Remember, many women change tampons before they are entirely saturated - and our guide is based on tampons used to their saturation point.

Most Proof users find they can wear our period underwear for 12+ hours before changing. In other words, when you find the absorbency level that suits your flow, you can wear them as you would a normal pair of undies - one pair during the day, and one pair at night - without having to change.

If you’re unsure of your absorbency level, or worry that Proof can’t handle your flow (trust us - it can!), you may want to consider wearing Proof as a backup for your tampon or cup before switching completely. Consider it the ‘dating’ phase of period underwear. We’re pretty sure you’ll be going steady in no time at all.

Will period underwear smell?

Proof leakproof undies are constructed with unique antimicrobial fibers that reduce odor and inhibit the growth of bacteria, to help you feel fresh and dry.

Help! I have a super heavy flow - what period underwear is best for a heavy period?

Heavy periods have met their match. Proof period undies were designed to handle even the heaviest of flows.

The Hipster is a super heavy period's BFF. Equipped with a super-absorbent core that holds up to 5 regular tampons or 10 tsp and front-to-back protection so you're covered, even overnight! Other heavy flow MVPs: The Bikini and The Mesh Hipster handle that time of the month like a boss.

Can Proof period undies replace pads and tampons? Can I use it with a cup?

In a word, yes!

Proof period undies were designed to replace pads and replace or backup tampons and cups. Simply choose an absorbency level based on your typical flow, or how many tampons you use in an average day on your period.

We use a unique combination of super-absorbent materials that pull in moisture and absorb liquid, helping to keep you dry and confident. Our Leak-Loc™ edges ensure that drips stay in the Proof - and not on your pants. Our super heavy styles hold 5 tampons or 10 teaspoons of liquid, and have been able to lock in even the heaviest flows!

If you're unsure about switching to Proof completely, you may feel more comfortable using Proof undies as a back-up for your menstrual cup or tampon, and then gradually making the switch.

How do I wash Proof period underwear?

Washing Proof period underwear is easy! Proof undies feature strong protection, but should be washed gently. Simply toss in the washing machine on a delicate cycle, using cold water and mild detergents. Hang or lay flat to dry. No washing machine? Hand washing in cold water with a gentle detergent works great, too!

More helpful tips to care for your pair:

-Don’t wring or twist your undies

- be gentle when washing Proof

-Hot water, harsh detergents, and bleach can damage the absorbent technology in Proof undies, so be sure to use cold water and mild detergent

-Hang or lay flat to dry - do not put in the dryer

-Proof undies have a super absorbent core that can take between 6 and 24 hours to dry. Heavier absorbency pairs have more layers of absorbent material, and will take longer to dry than our light pairs. To expedite the drying process, blot away excess moisture from the gusset before laying flat or hanging to dry.

-Want a refresh? To make your period undies fresh and remove any lingering odor, use a few drops of vinegar or tea tree oil during the rinse cycle of your wash - voila! So fresh and so clean.

What is the best period underwear for tweens?

We might be biased, but you will be too once your tween tries our period underwear. From invisible protection to buttery soft fabric our collection of period underwear for tweens is unmatched. Wear them again and again - period or not. They’re like the basics made better (way better). Available in fun colors and a variety of styles, there is nothing that screams period underwear about our collection. Our undies are period proof because life doesn’t stop just because it’s that time of month.

Types of period undies for tweens

Our period underwear are designed for you. Choose from a variety of sizes, styles, colors, and patterns - all designed for invisible protection and pure comfort. Meet our ultimate tween period underwear leak protection.

  • Proof® Teen Everyday Bikini (super-light absorbency - holds up to 1 light pad or panty liner)
  • Proof® Teen Boyshort (moderate absorbency - holds up to 3 regular pads or 6 teaspoons)
  • Proof® Teen Brief (moderate absorbency - holds up to 3 regular pads or 6 teaspoons)
  • Proof® Teen Hipster (super-heavy absorbency - holds up to 5 regular pads or 10 teaspoons)

Benefits and features of leakproof period undies

Our unseen but powerful tween period undies offer so many benefits. From their seemingly dreamlike comfort to their leakproof protection, these are undies you can live your life freely in.

  • Multi-way stretch fabric that moves with your body.
  • Breathable and comfortable buttery soft material.
  • No-show edges (hello invisible protection, but the kind with no strings attached).
  • Patented Leak-Loc® edges help lock moisture in to help you feel dry, protected, and most important confident.
  • Variety of styles and absorbency levels to choose from.
  • Reusable choice - wash and reuse!
  • Designed to fight odor.
  • Moisture-wicking liner helps you feel dry.

How do I use period undies?

Period undies are so much more than period undies. They can be used just like your basic undies, but they offer more protection. Simply wear, wash, and reuse. Whether you are exercising, playing sports, or on your period, our period undies can be worn to fight odor and protect from leaks while keeping you dry. Inspire confidence through comfort when you feel secure in your undies. There are no rules regarding what you can and can’t do in this thing.

Can I wear period underwear to school?

Tweens on their period should definitely be wearing period underwear to school, and all the other places they go too. From light sprinkles to heavy flows, we’re here for you. We’ve got all leaks covered. But, that’s not all our period underwear are good for. With a moisture-wicking liner that helps you feel dry and breathable fabric that moves with you, you can wear our undies while playing sports, hanging with friends, sleeping, or anything else you wish - period or not. Meet the new staple in your underwear drawer. But, don’t take our word for it, the proof is in the package.

Do I need to wear anything else with my period undies?

With a variety of absorbency levels and styles to choose from, you can shop with confidence at Proof. Our period underwear can be used to replace or backup disposable menstrual products. The idea of this might sound a little scary at first, but give it a try, you’ll be glad you did. You may know your period is here, but others will not. Say yes to invisible but powerful protection.

Will Proof period undies smell?

Underwear can smell, there’s no denying that. Your basic underwear probably does not fight odor and for that this is another reason our period underwear are basics made better. All Proof® Period Underwear is designed to fight odor. Just another way we help you live more and worry less.

Are period undies for tweens reusable?

You can wear our tween period underwear over and over again. All are machine washable so you can use and wash, not use and toss. For maximum use, follow our recommended care instructions. Super comfy and reusable. . . what else could you want?

Can I sleep while wearing period undies?

Our period underwear can be worn day or night. Designed for all day comfort, you can wear our period undies just as you would your basics. While you can wear them the same, you won’t feel the same about them. From the moment you slip into a buttery soft pair of protective period undies you will know exactly what we’re talking about.

How to care for your period undies

The benefits of our undies just get better and better. To care for your period undies simply wear, wash, and reuse. Meet the reusable choice for period protection. Our recommended care instructions are as simple as . . .

  1. Be gentle

    All of our undies are machine washable. We recommend washing on a delicate cycle with cold water with delicate detergents. To keep your panties sanitized, refresh them with a few drops of tea tree oil or vinegar in the rinse cycle. In a hurry? You can hand wash them too.
  2. Keep it cool

    To keep your period underwear lasting as long as possible, avoid hot water, harsh detergents, bleach, or softeners. Refer to step one above for substitutes to keep your undies fresh. Afterall, you wouldn’t want to compromise our secret agent, the Leak-Loc® technology.
  3. Let it all hang out

    Hang or lay flat to dry and skip the dryer. Expect our undies to take between 6-24 hours to dry. To expedite the drying process, blot excess moisture and hang dry. Stock up to make sure you are always covered.