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 Leak Proof® underwear that looks as good as it feels.
Holds up to 1 light tampon
• Leak-resistant up to 1 light tampon• Panty liner replacement• Everyday protection• Light spotting• Discharge
Holds up to 2 regular tampons
• Leak Proof® up to 2 regular tampons• Moderate periods• Replace or backup a pad, tampon or cup• Fights odor• Wicks moisture, quick drying
Holds up to 5 regular tampons
• Leak Proof® up to 5 regular tampons• Heavy periods• Replace or backup a pad, tampon or cup• Fights odor• Wicks moisture, quick drying
Designed with our patented Leak-Loc® technology
Pulls in moisture, helping you stay dry
Moisture-wicking liner pulls wetness away from the body to help keep you dry
Use and wash, not use and toss
How does Unders Leak Proof® technology work?
Unders look and feel just like normal undies but have built-in, leak proof® technology.
Our Quick-Wick liner pulls moisture away from the body and into the super absorbent core, helping you to feel fresh and dry. Leak-Loc® edges seal in leaks and prevent liquid from escaping the undies.
Wear as you would normal undies and then machine wash and reuse again and again!
What is the difference in absorbency levels?
All Unders feature our specially crafted leak protection – the higher the absorbency, the more layers of protection!
Here’s a quick absorbency breakdown:
Where can I buy Unders by proof?
You can buy Unders at some of your favorite in-store retailers.
To find Unders in a store near you, use our store locator tool below.
Are Unders by proof reusable?
Yes! One of the biggest benefits of switching to Unders is that our ultra absorbent undies are machine-washable and reusable, so you can use them again and again.
Not only does this keep single-use plastic period and incontinence products out of landfills and oceans, but can save you money over the lifetime of your Unders. Talk about a win-win!
How do I wash my Unders?
Unders feature strong protection, but should be washed gently. Simply toss in the washing machine on a delicate cycle. We recommend using cold water and mild detergents. Hang or lay flat to dry.
Can Unders be used as an alternative to a pad, tampon or cup?
In a word, yes!
Our heavy absorbency level holds up to 5 tampons, and have been tested to lock in even the heaviest flows.
If you're unsure about switching to Unders completely, you may feel more comfortable using Unders as a back-up for your menstrual cup or tampon.
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.