Night Defense Essential Inertia Overnight Underwear™
Night Defense Essential Inertia Overnight Underwear™
Night Defense Essential Inertia Overnight Underwear™
Night Defense Essential Inertia Overnight Underwear™
Night Defense Essential Inertia Overnight Underwear™
Night Defense Essential Inertia Overnight Underwear™
Night Defense Essential Inertia Overnight Underwear™
Night Defense Essential Inertia Overnight Underwear™

Night Defense Essential Inertia Overnight Underwear™

  • INNOVATIVE PERIOD CARE - Inspired by a rising trend in Korea, this unique hybrid between an overnight pad and period underwear provides the ultimate period protection and comfort.
  • 100% CERTIFIED ORGANIC COTTON TOP SHEET - Made with OCS certified, non-GMO cotton, Grown without the use of toxins, pesticides or synthetic chemicals.
  • MAXIMUM COVERAGE & ABSORBENCY - Built-in 4-layer core instantly absorbs odor and holds as much as 4 regular pads to keep you leak-free all night for up to 12 hours.
  • SECURE & COMFORTABLE FIT - Feels like regular underwear but with 360° leak prevention and curve-hugging fit for all-day comfort.
  • HEAVY FLOW SUPPORT - Ideal for overnight support, heavy flows, teens and tweens with irregular cycles, and postpartum bleeding.
Size
  • m
  • l
  • xl
Counts
  • 12 Pack [96 counts]
$149.99
$227.88

Description

Direction

Ingredients

Super-Long 44.7cm Leak Guard Core wraps the entire hip and back area for complete overnight protection.

Dual-Stitched Side Barriers

double layer leak defense with secure leak-guard banding and protective side skirts.

Ergonomic Body Fit Design contours perfectly to your body for all-night comfort. Finished with a 100% organic cotton cover and certified Dermatest Excellent for proven skin safety.

1. When unfolded, the waistband with the red printed line indicates the front side.

2. Wear from the bottom up just like regular underwear. (Do not wear with additional underwear; use alone.)

3. After use, roll up the product tightly from the bottom.

4. Pull the side waistbands together and tie them for neat disposal.

5. Dispose of in a trash bin—do not flush.

100% Organic Cotton Cover: soft and gentle on skin
Breathable Film: long lasting airflow and freshness
SAP-FREE Absorbent Core – free from microplastics, gentle on skin
Certified Dermatest Excellent

SHAPE

ABSORPTION

ORGANIC

CLINICAL TEST

Body-Contoured Comfort
Designed to Fit Your Natural Shape

From bedtime to morning, INERTIA Overnight Underwear moves with your body for all-night ease. 

The micro-fit waistband comes in 3 sizes 
for a snug yet pressure-free fit, 
while the high-waist design gently hugs 
the lower belly for cozy, secure comfort.
- SAP-Free, Plastic-Free Absorbent Core
- Exclusive Patent from Women-Led R&D
- Inspired by Hemostatic (Bleeding-Control) - Technology
- Gentle Enough for Sensitive Skin
360° Leak-Lock Protection
No leaks. No pooling. No wake-ups.

It features a 360° leak-guard design 
that protects from every angle—even 
while you toss and turn. 

The 44.7 cm super-long core wraps the hips and back for complete coverage, 
while side skirts provide extra defense against leaks. 
- 44.7 cm Super-Long Core – full hip & back coverage
- 360° Absorption System – blocks leaks from all directions
- Side Skirt Leak Guards – prevent side leaks during movement
- SAP-Free, Plastic-Free Core – gentle and safe for skin
MO_250811_A__pron_01
100% Cotton Cover
Soft, Gentle, and Breathable

The cover that touches your skin is made with 100% pure cotton—
delivering soft comfort without irritation. 

Thin yet highly absorbent, the cotton cover works together with a breathable film 
to provide lasting airflow and freshness 
all night long.
- 100% Cotton Cover on Skin-Contact Layer
- Gentle Softness Without Irritation
- Lightweight Yet Highly Absorbent
- Breathable Film for Long-Lasting Freshness
MO_250811_A__pron_08
Clinically Proven, 
Dermatologist Tested
Your skin deserves proof, not promises.

Our pads have been dermatologically tested and rated “Excellent” by Dermatest®, 
one of the world’s most trusted skin safety labs in Germany.

We test for irritation, allergens, sensitivities, and daily use safety.
- “Excellent” Rating by Dermatest® Germany
- Allergy Patch Test Completed
- Suitable for Daily Use
- Safe for Sensitive & Intimate Skin
- Tested on Real Women, Not Just Data
Ordering Made Simple
  • Subscribe & Save

    Stay stocked without the stress.
    Get your INERTIA essentials delivered regularly at a discount. Cancel anytime.
  • One-Time Buy

    Just need one box?
    Order whenever you want, no subscription needed.
  • Support Women, Globally

    Every purchase helps us provide period care products and education to women in underserved communities—because dignity in health should be universal.
Find Your Flow
We know every body's flow is unique, 
that's why we've got you covered with 
our range of pad options.
PON_07_1d9898c4-6afc-4cdc-82f5-21a1c64f1538
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Customer Reviews

Based on 180 reviews
77%
(139)
23%
(41)
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(0)
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S
Sungju kim
Surprisingly Comfortable and Thoughtfully Designed!

I didn’t expect to love this pad so much, but INERTIA really impressed me. First off, the packaging is beautiful—it actually made me feel like I was opening something special, not just another box of pads. The design is sleek and minimal, and the materials feel super soft and gentle on the skin.I especially appreciate that it’s made with organic cotton, and you can really tell the difference. No irritation, no weird plasticky feeling—just clean, breathable comfort all day. The leak and odor lock technology works way better than I expected for a regular pad.Also, the fact that it’s only 10 in a box makes it great for trying out or keeping in your bag just in case. Definitely going to repurchase and try their other absorbency levels!

J
Jieun
Safe, Comfortable Pads You Can Trust

INERTIA is a sanitary pad brand created by Korean female scientists. It’s made from 100% pure cotton, so it’s gentle on the skin and there’s no need to worry about any odor.After trying it, I found that it has excellent absorption, so I didn’t have to worry about leaks at all. It has also passed sensitive skin tests by Germany’s Dermatest, which makes me feel even more confident using it.The sizes are clearly labeled, making it easy to choose the right one, and it’s convenient to store neatly in its case. I highly recommend it for anyone looking for a safe, comfortable, and worry-free pad!

S
Sun B
Best organic pad I’ve tried

I’ve been using this brand for a while now, even though I originally thought it was a bit pricey. But honestly it’s worth it!! This is the only pad that doesn’t make me feel heavy (like that subtle aching, if you know what I mean) or damp down there. I think it might be because it doesn’t have microplastics? I’ve tried other “organic” pads from cvs, but most of them only use organic cotton on the top layer, which doesn’t really help… These actually feel breathable and super comfortable. I feel clean and dry all day, and that peace of mind is totally worth the extra cost. I’ll keep coming back to it - highly recommend!

K
Kenny_min
As a total pad nomad, this one is a game changer!

I only care about two things when it comes to pads: softness and absorbency. And let me tell you—this one is unbelievably soft. Like, next-level soft. I was honestly shocked the first time I used it. And yes, it absorbs really well too. If you’ve been bouncing between brands like I have, you NEED to try this. Highly, highly recommend! I opened one pad to show its soft texture!

C
Charles
Organic cotton pad for women ❤️

In Korea, inner beauty is in vogue these days.👑 They put health first before women who take care of their appearance.So I always choose sanitary pads carefully as they touch important parts of a woman, so I tried this brand this time.In the United States, there were a lot of sanitary pads made of vinyl, so I felt very uncomfortable on my skin. I've tried a variety of brands, but in the end, I've never felt as satisfied as the sanitary pads I used in Korea.So I thought I could buy a Korean sanitary napkin on Amazon, so I tried it without worrying.I studied for 30,000 hours, 387 studies! 8 weeks of clinical trials, 13 reviews. It was unbelievable.When I took it out of the box, first of all, the meticulous and clean packaging already gave me trust.When I bought sanitary pads in the U.S., there were some products that were not packaged one by one and just came in a box! This sanitary pad felt good from the moment I took it out.This brand is a good and warm-hearted company that has signed a regular donation agreement with the Children's Welfare Association for sanitary pads.Organic sanitary pads are microplastic-free! It is a sanitary pad that uses 100% organic pure cotton to the wings and inside.There are many places that usually use pure cotton and promote it as organic, but the brand made it without overlooking any small parts except for all the harmful ingredients for women's health.And it is said that every layer is made of Bio-based material, from the cover and film of sanitary napkins that are 100% decomposed in nature. These days, when plastic is a problem, this brand that even thinks about the environment... I think it's so good.The absorption was very good and the surface was so soft that I didn't feel any discomfort at all. Many women tried this brand and thought, "I hope you don't feel uncomfortable using sanitary pads anymore." It was uncomfortable to bring sanitary pads from Korea every time, but now I'm going to use this product only. If I have female friends, I really want to buy it and give it as a gift!

Frequently Asked Questions
Are Inertia pads safe for sensitive skin?
Yes.
All Inertia pads are dermatologist-tested, hypoallergenic, and free from plastic, fragrance, chlorine, dyes, and phthalates. Crafted with 100% certified organic cotton and Labocell™ cores, they’re ideal even for the most reactive skin.
Does it really not leak?
Yes. It’s built with dual leak-proof protection—double-locking side skirts plus side guards and a leak-guard band. 
On top of that, the 44.7 cm full-length core gives you 360° leak protection. No leaks, even overnight.
How should I choose between Regular, Medium, or X-Large?
  • Regular: Up to US Medium (US 8–10, EU 40–42)
  • Medium: US Medium (US 8–10, EU 40–42) ~ US X-Large (US 16–18, EU 48–50)
  • X-Large : above US X-Large
Recommendation: Start with Medium and adjust based on your flow and comfort needs.
Do you ship to my country?
We currently ship across the U.S. with standard and expedited options.
 International shipping is available to select countries (Canada, EU, Australia). Duties and taxes may apply—costs will be calculated at checkout.