What Is Period Underwear and How Does It Work? Your Complete Guide

No pads to position. No tampons to change every few hours. No midnight leak anxiety. That's the promise of period underwear — and thousands of teens and women are making the switch to simpler, more comfortable period care.

Jump to What it is How it works Safety Absorbency When to wear Care guide FAQs

12 hrs

Of worry-free protection, day or night

10 tampons

Worth of flow held in heavy flow styles

2+ years

Lifespan with proper care

100+

Harmful substances tested for — OEKO-TEX® certified

What is period underwear?

Period underwear is reusable underwear designed to absorb menstrual flow and prevent leaks — without any extra products. Instead of wearing a disposable pad or constantly changing tampons, the absorbency is built right into the fabric. You simply put them on like regular underwear and go about your day.

Cheeki is designed for

Teens and first periods — simple, stress-free protection with zero learning curve
Everyday comfort — wear alone or as backup with tampons or cups
Heavy flow and overnight — sleep through the night without worry
Active lifestyles — no bulk, no chafing, no interruptions to your day

How does period underwear actually work?

Think of it like this: regular underwear + built-in pad technology = period underwear. Cheeki's 4-layer comfort tech is engineered to keep you dry, protected, and comfortable all day long.

Moisture-wicking top layer

Pulls moisture away from your skin instantly so you stay dry and comfortable — never wet or sticky.

Super-absorbent core

Locks in your flow and holds it securely throughout the day. This is where the magic happens.

Leak-proof barrier

A protective waterproof layer prevents leaks from escaping — even on your heaviest days.

Breathable outer layer

Keeps everything secure while allowing air to flow, so you never feel stuffy or uncomfortable.

The result? Up to 12 hours of worry-free protection that feels like just wearing underwear. No bulk. No bunching. No constant adjusting.

Is period underwear safe?

Absolutely — and we take this seriously. Your health and safety are our top priorities, which is why every pair of Cheeki underwear is made with rigorously tested, body-safe materials.

OEKO-TEX® Standard 100 certified — every fabric tested for 100+ harmful substances
No PFAS "forever chemicals" — safe for your body and the environment
No silver or harsh antimicrobials — just breathable, gentle fabrics
Trusted by thousands of teens, parents, and women worldwide

Why it matters

Period products touch some of your most sensitive skin for hours at a time — especially important for teens. Cheeki meets the strictest safety standards in the industry so you never have to compromise between comfort and safety.

How much protection do you need?

Not sure which absorbency level is right for you? Here's a simple breakdown:

Medium flow

Holds ~30ml

≈ up to 6 tampons or 2–3 regular pads

Light to moderate flow days
First or last days of your cycle
Backup with tampons or cups
Everyday "just in case" coverage

Heavy flow — most popular

Holds ~50ml

≈ up to 10 tampons or 1 overnight pad+

Your heaviest 1–2 days
Overnight — sleep through the night
All-day confidence without changing
Anyone prone to leaks

Pro tip

Most customers start with a mix — 1–2 medium flow pairs for lighter days and 1–2 heavy flow pairs for heavy days and overnight. Our Starter Kits make this easy.

When should you wear period underwear?

The beauty of period underwear is its versatility — you can wear it however works best for you.

As your main protection

Wear Cheeki alone on regular, heavy, or even your lightest days. Many customers ditch pads and tampons entirely.

As backup protection

Pair with tampons or menstrual cups for extra security on super heavy days. Perfect peace of mind.

Overnight

Heavy flow styles are specifically designed for sleeping. No more middle-of-the-night changes or sheet anxiety.

Teens and first periods

Simple and manageable during school days, sleepovers, and sports. No awkward changes in public bathrooms.

"I used to worry constantly about leaking through my jeans during class. Now I just wear my Cheeki Brief and completely forget I'm even on my period."

— Sarah, age 14

"The Heavy Flow is literally the only thing I trust overnight now. I haven't had a leak in months and I actually sleep through the night."

— Jessica R.

Customer-favourite styles to start with

Best for teens

Teen Bamboo Comfort Brief

Breathable bamboo cotton blend. Soft, lightweight, and naturally comfortable all day. Heavy flow protection.

Shop this style →

Most versatile

Seamless Period Brief

Smooth invisible fit under anything — leggings, jeans, skirts. No lines, no bulk, no stress.

Shop this style →

Maximum coverage

Laci Leak-Proof Brief

Full-coverage comfort with heavy flow absorbency. Soft and reliable for heavy days and overnight.

Shop this style →

Not sure where to start?

Browse our Starter Kits — we've bundled the most popular pairs for every cycle need so you don't have to figure it out alone.

How to care for period underwear

One concern we hear: "Isn't washing them gross?" The truth is it's actually easier — and less messy — than dealing with pads and tampons.

Rinse in cold water for about 30 seconds — the water runs clear quickly
Machine wash with your regular laundry on a gentle cycle
Air dry by hanging or laying flat to keep them lasting longer

No special detergents. No complicated steps. No soaking overnight. With proper care, Cheeki underwear lasts 2+ years — that's 200+ disposable products you won't buy or throw away.

Pro tip

Use a Cheeki Wash Bag to protect your underwear in the machine and extend their lifespan. Toss the bag in the wash and you're done.

Why choose Cheeki?

Disposable products (per year)

✗~$192/year on pads and tampons
✗$960+ over 5 years
✗~11,000 products in a lifetime
✗~200 lbs of landfill waste per person
✗Constant trips to the store

Cheeki period underwear

✓Starter Kit from $79 — lasts 2+ years
✓Saves hundreds of dollars over time
✓One pair replaces 200+ disposables
✓Dramatically reduces landfill waste
✓Always prepared — no store runs needed

Frequently asked questions

Does it feel wet all day?

No. The moisture-wicking top layer pulls liquid away from your skin so you stay completely dry. The absorbent layers lock everything in — you won't feel damp or sticky.

Can you see it through leggings?

Not at all. Cheeki is designed to be seamless with no visible lines, padding, or bulges. Wear them under leggings, jeans, skirts — anything. No one will know but you.

Does it smell?

No. The breathable fabrics and moisture-wicking technology prevent odor buildup. As long as you rinse and wash them properly (which takes about 2 minutes), they stay completely fresh.

How long can you wear them?

Most people wear Cheeki for 8–12 hours depending on their flow. Heavy flow styles are specifically designed for all-day or overnight wear.

How many pairs do I need?

We recommend starting with 3–5 pairs so you always have clean ones ready to rotate through your cycle. Our Kits and multi-packs make this affordable and easy.

Is washing them gross?

Not at all — just rinse in cold water for 30 seconds then toss in the wash. It's genuinely easier and less messy than dealing with pads and tampons.