We believe that quality period and leak care should be accessible to all women. That's why we created Unders: affordable, machine washable period and leakproof underwear that looks as good as it feels. Designed by and for women with Proof's unique patented Leak-Loc™ technology and now available at Target and Meijer.
Holds up to 1 light tampon
• Leak resistant up to 1 light tampon
• Panty Liner Replacement
• Everyday Protection
• Light Spotting
Holds up to 2 regular tampons
• Leakproof up to 2 tampons
• Moderate Periods
• Replace a Pad
• Replace or Backup a Tampon/Cup
• Fights Odor
• Wicks Moisture
Holds up to 4 regular tampons
• Leakproof up to 4 tampons
• Heavy Periods
Where can I buy Unders by Proof?
You can buy Unders at some of your favorite retailers in-store.
To find Unders in a store near you, use our store locator tool.
How do I wash Unders period underwear?
Unders 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.
To learn more about how to care for your pair, keep reading.
How do I know which absorbency level to buy?
Unders is designed in a range of absorbencies to fit every flow. To find the perfect protection, select a pair based on your absorbency needs.
-Light: Holds one light tampon or panty liner. Great for in-between days, light flows, spotting, and back up protection.
-Regular: Holds up to 2 tampons. Great for moderate flows, replacing pads, and replacing or backing up tampons and cups.
-Heavy: Holds up to 4 tampons. Great for heavy flows, replacing pads, tampons, and cups, and for overnight protection.
Can I wear Unders period underwear with a tampon or cup?
Yes! Unders is perfect back up for tampons and cups, or to replace your current period products all together. Have an unpredictable flow? Wear Unders every day for built-in protection on in-between days.
Invisible protection for life's little leaks
A classic silhouette with discreet leak protection
The ultimate in leak 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.