The ultimate in leak protection
A classic silhouette with discreet leak protection
Eliminate panty lines and light leaks
Basic made better, protection from all kinds of leaks
Super absorbent and powerful leak protection
Cheeky style with built-in leak protection
A leak-resistant undie that smooths and soothes with light compression in all the right places.
Fully covered, fully comfortable.
Invisible protection for life's little leaks
A little extra beauty for your booty
Vintage style with powerful protection
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
Our plus size period underwear isn’t just for periods. Protect yourself against all types of leaks:
Whether you’re looking for heavy flow plus size period panties or super light protection for barely there days, Proof offers several levels of absorbency.
- Super-Light: Up to 1 light tampon or panty liner
- Light: Up to 1 regular tampon or 2 teaspoons of liquid
- Moderate: Up to 3 regular tampons or 6 teaspoons of liquid
- Heavy: Up to 4 regular tampons or 8 teaspoons of liquid
- Super-Heavy: Up to 5 regular tampons or 10 teaspoons of liquid
Currently, you can shop up to 3XL in our Leakproof Brief, Leakproof Hipster Underwear, Leak-resistant Everyday Undie, and Leak-resistant Everyday Bikini.
In the future, we hope to offer plus size period panties in all of our styles.
Our plus size period panties are leak-resistant or leakproof (depending on the absorbency level), so you won’t need to pair them with any other period products unless you want to.
Yes! Our patented absorbent core makes all of our plus size period underwear super moisture-wicking and sweat resistant so you stay feeling dry all day long.
Unlike other bulky brands, Proof plus size period panties look and feel just like your favorite underwear, with discreet, trustworthy built-in protection. Our undies are silky soft, breathable, and made with move-with-you material. Plus, they come in a variety of styles and silhouettes, so you can choose the style most comfortable for you.
We recommend hand rinsing your plus size period underwear before tossing them in the washing machine on a delicate cycle. Always use mild detergents and wash in cold water to preserve the life of your period panties. Hang or lay flat to dry, and give them up to 24 hours to fully dry depending on absorbency.
You can wear plus size period panties every day of the week as long as you have enough to go around! Even if you’re not on your period, our light and super-light absorbency panties are perfect for everyday discharge, bladder leaks, sweat, and anything else that might get in the way.
Proof offers some of the best period underwear for plus sizes on the market because of our patented Leak-Loc® technology. These panties are comfortable, breathable, moisture-wicking, and offer serious protection you can count on.
All of our plus size period underwear is made with several layers of materials in order to provide all-day protection. The layer closest to your skin wicks away moisture so you feel dry, followed by a layer of absorbent antimicrobial fibers that fight bacteria and odors and a layer that acts as a liner shield to keep leaks at bay. The outermost layer is made from water-proof fabric and Leak-Loc® edges, to guarantee coverage and protection.
60 day leak free guarantee
FREE SHIPPING on all orders OVER $50
With a pair for every flow, you’ll be able to find your Proof™-perfect fit.
Our Patented Leak-Loc™ technology keeps you leak-free learn more
Proof™ provides serious protection from bladder leaks, without added bulk.
Discrete protection with room to accommodate your growing bump.
Designed with new moms in mind, leak protection without the bulk.
Go ahead, break a sweat. Our moisture-wicking fabric also reduces odor.
Undercover protection for every day of the week.
Perfect for daily discharge, Proof™ keeps you fresh and dry.
For in-between days, these undies keep you spotless all day long.
Holds up to 1 Light Tampon or Panty Liner
panty liner replacement
Holds up to 1 Regular Tampon or 2 Teaspoons
light period leaks
Holds up to 3 Regular Tampons or 6 Teaspoons
moderate period leaks
light bladder leaks
replace or back up a tampon, pad, or cup
Holds up to 4 Regular Tampons or 8 Teaspoons
moderate bladder leaks
heavy period leaks
replace a pad
replace or back up a tampon or cup
Holds up to 5 Regular Tampons or 10 Teaspoons
maximum overnight period protection
Your hip and waist measurements are the most important size when finding the perfect fit.
Measure around your body as shown.
Find your waist measure by leaning over to one side. Where your body naturally creases is your where you will place the tape. Measure parallel to the ground.
For your hip measurement, turn to the side and locate the fullest part of your booty. Place the tape around your body, parallel to the floor, around the widest and fullest part of your hips and tush.
If your measurements fall into different size categories, your hip measurement will be most accurate.