Medium vs Heavy Absorbency: Which One Should You Choose?

The question we hear most: "Which absorbency level do I actually need?"

If you're new to period underwear — or shopping for a teen — choosing between medium and heavy flow can feel confusing. But here's the good news: it's simpler than you think. Cheeki has just two absorbency levels so you can find the right fit without overthinking it.

Jump to At a glance Medium flow Heavy flow Which to choose Shop by absorbency Starter combos FAQs

Medium vs heavy: at a glance

	Medium flow	Heavy flow
Capacity	~30ml	~50ml
Equivalent to	Up to 6 tampons or 2–3 pads	Up to 10 tampons or 1 overnight pad+
Best for	Regular days, light to moderate flow	Heavy days, overnight protection
Feel	Surprisingly sleek and slim	Soft, secure, and reliable
Wear time	8–12 hours	8–12 hours including overnight
Overnight	Light sleepers only	Designed for overnight
School / work days	Perfect	Great for extra security

The two absorbency levels

Medium flow

~30ml

≈ up to 6 tampons or 2–3 regular pads

✓Regular daytime wear
✓Light to moderate flow days
✓School, work, and activities
✓Backup with tampons or cups
✓Teens just starting out

Shop medium flow →

Heavy flow — most popular

~50ml

≈ up to 10 tampons or 1 overnight pad+

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

Shop heavy flow →

Medium flow — your everyday go-to

Holds ~30ml, equivalent to up to 6 tampons. Surprisingly sleek and slim — you'd never guess there's built-in protection. It truly feels like regular underwear.

Your go-to for moderate flow days — comfortable protection that moves with you
Perfect for the first or last days of your cycle when flow is lighter
Great as backup protection alongside tampons or cups on heavier days
Ideal for teens just starting their period journey — confidence without bulk

"I wear medium for school days and honestly forget I'm even on my period. It's that comfortable."

— Sarah, age 14

"Perfect for my lighter days — no bulk, no stress, just normal underwear that happens to be leak-proof."

— Emily R.

Heavy flow — your overnight hero

Holds ~50ml, equivalent to up to 10 tampons. Soft, secure, and totally reliable — without the bulkiness of traditional overnight pads. Maximum coverage that still feels like comfortable underwear.

Built for your heaviest 1–2 days when flow is at its peak
Sleep through the night without leaks, 3am panic changes, or sheet anxiety
12 hours of all-day confidence — no need to change during long days
Perfect for sleepovers and travel when changing isn't always convenient
Extra peace of mind for anyone with unpredictable or heavy flow

"The heavy flow is literally the only thing I trust overnight now. I haven't leaked through my sheets in months."

— Jessica R.

"I used to set alarms to change my pad at 3am. Now I actually sleep through the night. Game changer."

— Alex M.

Which absorbency should you choose?

If you're unsure, the answer is simple: start with both. Most customers use medium during the day and heavy overnight — this covers your entire cycle without any guesswork.

Choose medium flow if...

→Your flow is light to moderate most days
→You want everyday daytime protection
→You prefer a slimmer, sleeker feel
→You're using period underwear as backup
→You're a teen just starting out

Choose heavy flow if...

→Your flow is heavy, especially days 1–3
→You need reliable overnight protection
→You want all-day coverage without changing
→You're tired of leaks and want maximum security
→Your flow is unpredictable

Our recommendation

Start with 2–3 medium + 1–2 heavy pairs. This gives you flexibility to discover what works best for YOUR body — because every cycle is different. Many customers end up loving heavy even on lighter days just for the extra peace of mind.

Shop by absorbency

Medium flow — daytime and moderate days

Seamless & invisible

Seamless Period Brief

Smooth, invisible under anything. No lines, no bulk — just comfortable daytime protection for school, work, and everyday wear.

Shop this style →

Low-rise fit

Seamless Low-Rise Brief

Same seamless comfort with a lower-rise cut. Great for low-rise jeans and personal style preference.

Shop this style →

Heavy flow — heavy days and overnight

Best for teens

Teen Bamboo Comfort Brief

Breathable bamboo cotton blend with heavy flow absorbency. Soft and reliable for school days, sports, and overnight.

Shop this style →

Customer favourite

Laci Leak-Proof Brief

Full-coverage comfort with soft, reliable heavy flow protection. A favourite for nighttime confidence and heavy days.

Shop this style →

Not sure which style?

Browse our Kits & Sets — we've bundled the most popular styles in both absorbency levels so you can build your perfect rotation without the guesswork.

Popular starter combos

Here's what real customers actually buy — find the rotation that fits your flow:

The balanced rotation

2 medium + 2 heavy

Full cycle coverage — the most popular starting point

The heavy favourite

1 medium + 3 heavy

For those who love maximum protection and peace of mind

The teen starter

2 medium + 1 heavy

Perfect for beginners and first periods

The minimalist

3 heavy only

Keep it simple with one absorbency that covers everything

Why Cheeki absorbency works

Both medium and heavy flow use the same proven 4-layer comfort tech. The only difference is the absorbent core — heavy flow has more capacity for higher protection. The feel and comfort stay the same.

Moisture-wicking top

Pulls moisture away from skin instantly — you stay dry, never wet.

Absorbent core

Locks in your flow. Heavy flow has a more robust core for higher capacity.

Leak-proof barrier

Prevents leaks from escaping even on your heaviest days.

Breathable outer layer

Keeps everything secure while air flows freely — never stuffy.

OEKO-TEX® certified

Every absorbency level is made with OEKO-TEX® Standard 100 certified fabrics — tested for 100+ harmful substances and safe for sensitive skin. Medium or heavy, you're choosing body-safe, non-toxic protection.

Frequently asked questions

Can I wear heavy flow during the day?

Absolutely. Heavy flow isn't just for nighttime. Many customers wear it during the day for extra peace of mind on heavy days, long work days, or travel when changing isn't convenient. There's no rule that says you can't wear heavy during the day — comfort is personal.

Can medium flow be worn overnight?

It depends on your flow. Medium works well for lighter overnight flow, but for moderate to heavy overnight flow we recommend heavy for leak-free sleep. If you're waking up to change or worrying about leaks, heavy flow is your best bet.

How long can I wear period underwear?

Most customers comfortably wear Cheeki for 8–12 hours depending on their flow. Medium is great for a full school or work day. Heavy is designed for all-day wear or a full night's sleep. Listen to your body — but most people are surprised by how long they can go.

What if I have an unpredictable flow?

Heavy flow is your friend. If your flow varies or you're not sure how heavy a particular day will be, heavy gives you extra coverage and peace of mind. You can't over-protect yourself.

Do I need different sizes for different absorbencies?

No — sizing stays the same across both absorbency levels. Choose your regular underwear size and you're good to go. If you're between sizes, we recommend sizing up for the most comfortable fit and best performance from the leak-proof layers.

I thought I'd only need medium — but I keep reaching for heavy. Is that normal?

Completely normal and very common! Many customers discover they prefer heavy even on lighter days just for the extra security and peace of mind. There's no wrong choice — go with whatever makes you feel most confident.