About Proof®

Proof® undies look and feel just like normal undies but have built-in, leakproof technology.

Our patented Leak-Loc® technology has multiple layers that draw in moisture and help lock in leaks. The Quick-Wick liner helps pull moisture away from the body and into the super absorbent core.

Our undies are designed to fight odor, helping you to feel fresh and dry. Plus, our styles are machine washable and reusable, and can be worn as normal undies.

To learn more about how Proof® works, keep reading.

Proof undies combine patented technology with soft, smooth fabric and thoughtfully designed details. Please see individual product pages for material contents.

The materials have been meticulously tested in an independent laboratory because Proof is committed to providing high quality care down there.

All Proof® undies feature our specially-crafted leak protection – the higher the absorbency, the more layers of protection!

 Here’s a quick absorbency breakdown:

- Super Light: Holds up to 1 light tampon or a panty liner
- Light: Holds up to 1 regular tampon or 2 teaspoons
- Moderate: Holds up to 3 regular tampons or 6 teaspoons
- Heavy: Holds up to 4 regular tampons or 8 teaspoons
- Super Heavy: Holds up to 5 regular tampons or 10 teaspoons

 You can shop by absorbency here.

We typically suggest buying your normal undie size. Some styles run a bit roomier, so be sure to check out our size guide and reviews by style to find your best fit!

Proof® undies are designed for all-day comfort. Our Super Light, Light and Moderate undies feel just like your favorite pair of regular underwear, but with built-in protection.

Our Heavy and Super Heavy styles may feel slightly more substantial due to their highly absorbent construction, but they will still feel ultra-comfortable. Most importantly, you’ll love the extra protection.


Yes! One of the biggest benefits of switching to Proof® is that leakproof undies are machine washable and reusable, so you can wear them again and again.

Proof® undies 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.

To learn more about how to care for your pair, keep reading.

Depending on absorbency level and humidity level, Proof undies can take between 6 and 24 hours to dry. To expedite the drying process, blot away excess moisture before laying flat or hang drying. 

Just like most intimates, how long they last depends on how well you care for them. Be sure to follow our care instructions to help your undies last even longer. 

Proof® undies are equipped with a moisture-wicking lining that helps fight odors. If you want, simply add a few drops of vinegar or tea tree oil to your washing machine during the rinse cycle and complete washing as normal.

Leak Types

Proof® is great for periods, bladder leaks, discharge, sweat, spotting, maternity and postpartum leak protection, and even everyday wear!

You can shop by leak type here.


 Depending on your chosen absorbency level, our leak-resistant and leakproof styles can hold anywhere from 1 light tampon to 5 regular tampons worth of liquid. 

 You may also feel more comfortable using Proof® undies as a backup to a menstrual cup or tampon.

Some of our period best sellers are The Bikini, The Mesh Hipster, and The Hipster, which handles even the heaviest flows! To find the best style for your period, shop by absorbency.

Proof is perfect for everyday wear, so you’re always protected. The Everyday Undie and Thong are ideal for day-to-day wear for any of life’s little leaks. You can shop by leak type here.

Yes! Proof® underwear were specifically designed for all of life’s little leaks. Our Super Heavy styles hold up to 10 teaspoons of liquid. Shop for bladder leaks here.

Proof is every new mama’s best friend for all of those unexpected pregnancy and postpartum leaks!

We recommend the Everyday Undie, the Lace Cheeky, or The Brief for ultimate comfort and a lower rise to accommodate your growing bump.

And don’t forget to grab Proof® undies for after baby – no more mesh hospital underwear! We’ve got you covered. 

Shop maternity styles and postpartum favorites.

Customer Service

While we try to keep our shelves well-stocked, sometimes a style is so popular that it sells out! 

If you're loving a style that's out of stock, you can sign up for alerts to be notified as soon as more inventory arrives. Choose the style, color, and size you would like, and select 'Notify When In Stock' then enter your email address and phone number to be alerted as soon as your favorites are back in stock! 

Our 60-day money back guarantee is our way of saying, we know you’re going to love Proof undies - but, if for whatever reason you are unsatisfied or our products do not meet your expectations, you can return them within 60 days for a full no-questions asked refund! The 60-day money back guarantee is for all first time orders only.

*60 days from the time of receipt of order.

Click the link below and enter your Order Number or Email to begin you return.

Start Your Return