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Get accurate measurements, we recommend you re-check your size with every purchase..

For most of our styles, the most important measurement is your hip size to get the right fit. It is also useful to check your waist measurement for certain styles. Please take a look at the product description for a guide.

If you're in between sizes, we suggest sizing up (e.g. from a size 10 to 12) for ultimate comfort.

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1. Place Your Feet Together

Having your feet apart can give a measurement that is actually larger than your hip area.

2. Waist

Your natural waist measurement should be taken at the narrowest part of your torso. This is where your body curves in and is often at or above your belly button.

3. Hip

Your hip measurements should be taken at the fullest part of your hips.

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We want you to feel confident ordering Pee Chee Cheex. Below you’ll find how our refunds, exchanges and guarantees work, depending on the reason your item is coming back.

100 Day Risk Free Guarantee (on any multipack)

Our 100 Day Risk Free Guarantee is here to help first-time customers try Pee Chee Cheex with confidence, and experience how our period undies perform, risk free.

This guarantee is about product performance, not fit or sizing. It’s designed so new customers can trial our leak protection with confidence.

How the 100 Day Risk Free Guarantee works

If this is your first order with Pee Chee Cheex, you’re covered under our 100 Day Risk Free Guarantee for one (1) pair only from a multipack.

When your order arrives, we recommend:

  • Washing and wearing just one pair first to trial performance during your period
  • Keeping the remaining pairs unopened, unworn, unwashed, and sealed (each pair is individually packed and sealed for hygiene reasons)

If the worn pair does not perform as intended, you can contact us within 100 days of receiving your order and we’ll help you out.

And just so you know — you don’t need to send back the worn pair.

Let us break it down for you

If you purchase a multipack and want to try Pee Chee Cheex for the first time, simply wear one pair to see how they perform.

If that pair doesn’t work for you, reach out to us within 100 days. Any remaining pairs must be unopened and sealed to be eligible for a refund or store credit.

Wearing more than one pair before contacting us may mean the order isn’t eligible under this guarantee.

A quick heads-up

This guarantee is designed to help first-time customers trial product performance only.  
Size or fit issues, size exchanges, change-of-mind returns, and orders placed by returning customers are handled separately — please see the sections below.

Size Exchanges

We want you to feel confident choosing your size. Our undies are made true to size, so we strongly recommend using our size guide before ordering.

If you need a size exchange, the following conditions apply:

  • Size exchanges must be requested within 30 days of receiving your order  
  • Each order includes one (1) complimentary size exchange
  • Items must be unopened, unwashed, unworn, and unused
  • Each pair must remain sealed in its original packaging for hygiene reasons  
  • Exchanges are available for the same style and colour only, subject to stock availability   

If you request additional size exchanges beyond the first, an exchange fee may apply to cover handling and shipping costs. We’ll always let you know any applicable fee before processing.

Important:  
Size exchanges are not covered under our 100 Day Risk Free Guarantee.

If the requested replacement size is unavailable, we’ll be in touch to discuss available options.

 

Change of Mind

If you change your mind, you can request a return within 30 days of receiving your order, provided the following conditions are met:

  • Proof of purchase is provided
  • Clear photographs (front and back) of the product packaging are supplied to help us assess the return
  • The product is unopened, unwashed, unworn, and unused
  • Each pair remains sealed in its original packaging for hygiene reasons
  • The packaging has not been opened, tampered with, damaged, or altered in any way

We don’t accept change-of-mind returns on Sale, Clearance, Factory Seconds, or Final Sale items, including products in our We Made Heaps category.

For eligible change-of-mind returns, we’ll let you know whether a refund, store credit, or exchange is available, depending on the circumstances. (This does not affect your rights in relation to faulty or incorrectly described products)

 

Faulty Product

We work extremely hard to ensure all Pee Chee Cheex products are made to a high standard. If something isn’t right, please reach out — we’re here to help.

If a product is faulty or not as described, you may be entitled to a remedy under Australian Consumer Law.

Depending on the nature of the issue, we may offer a repair, replacement, refund, or store credit, in line with your rights.

Products marked as factory seconds at the time of purchase are excluded from this section, as any known faults are disclosed upfront.

 

Cost of Returns

Who covers return shipping depends on why the item is coming back — here’s how it works.

  • 100 Day Risk Free Guarantee: If your return is approved under our 100 Day Risk Free Guarantee, we’ll take care of the return shipping. Just reach out to us first so we can help organise it.
  • Faulty or incorrectly described products: If something arrives faulty or not as described, we’ve got you. Return shipping will be covered in line with your rights under Australian Consumer Law.
  • Size exchanges and change-of-mind returns: For size exchanges or change-of-mind returns, return shipping costs are generally covered by the customer, unless we let you know otherwise.

To help make sure your return gets back to us safely, please follow the return instructions we provide. If items are sent back without getting in touch first or without using the suggested return process, we can’t be responsible for parcels that go missing along the way.

 

How To Complete Refunds & Exchanges

To get started, please email us at wecare [@] au.peecheecheex [dot] com before sending anything back. We’ll send you the required form to complete.

Don’t have a printer? No worries, just download the form, type your details into the fields provided, save it, and email it back to us.

Once we receive your email, our team will be in touch to confirm the next steps.

 

How To Pack and Send Returns

We recommend using the reusable satchel or mailer bag your order arrived in — it’s compostable and biodegradable.

Please don’t write on, label, tape, or attach anything directly to the Product(s) packaging.

If you’re arranging your own return postage, we recommend using a tracked service and keeping your tracking number until your return has been processed. This helps ensure your parcel gets back to us safely, as we’re unable to take responsibility for returns that are lost or go missing in transit.

 

How To Pack and Send Returns

Please allow time for your return delivery to reach us. This may very depending on your location. Refunds requests are reviewed within 48-72 hours of receiving your item. We will notify you once we’ve received and inspected your return, and let you know the status of your refund request. Depending on your payment method, please allow 2 to 4 weeks for refunds to be processed.


 

Please read more about Returning products to us in our Terms of Sale here.

The Experience

Enjoy the luxury of owning exclusive Curated Factory Selections—where comfort meets protection and smart patented design. Each piece is made to give you a life-changing experience by keeping you comfortable and protected from leaks. Absorbing up to 12 tampons of fluid so you can focus on what matters every day.

The Difference

Every piece is handcrafted with care, featuring tiny variations that are hard to notice. But the real difference is clear—each piece is wrapped in double layers of Lenzing modal fabric, offering a silky softness, natural moisture control, and breathability. This is premium quality you can feel.

The Craft

Experience period care that matches your high standards. Created for those who want the best, The Period Undie is built for your busy days. We spent 19,000 hours refining 57 designs with 49 premium fabrics, focusing on comfort, performance, and durability. Every detail is designed to prevent leaks and discomfort, ensuring you stay fresh and dry. We understand time is valuable—our period care is designed to keep you focused on what matters most to you.

The Value

Due to high demand, our Curated Factory Selections are limited. Get up to 34% off and up to $130 off multipacks, plus free shipping across Australia. We’re so sure you’ll love these period undies that we offer a 60-day risk-free guarantee on all multipacks. Try a pair and see the difference. This is designed for those who want the best in period care—a choice that reflects your high standards and taste.

Don’t miss this chance to make a change. Act now—this exclusive offer won’t last.

(*Limited to one multipack per person.)

We know this might feel risky

We get it. Trying something new, especially when it comes to period care. But with [pee chee cheex], you have nothing to worry about.

Here’s why:

With our 100 day Risk-Free Guarantee for all multipacks, you can try [pee chee cheex] with no dramas. No pressure. Try just one pair from a multipack, and if you don’t love it, return the unopened undies for a full refund.

See? No pressure at all.

And guess what? We’re adding FREE Shipping and Returns on any multipack too!

So, with nothing to lose, let’s take a look at why [pee chee cheex] multipacks are the smart choice.

Stop Throwing Away Money on Disposables—Choose the Smarter Option

Most of us spend $15 to $20 on disposables, every month—that’s over $200 a year, literally tossed away on single-use products. And that doesn’t even include the cost of replacing stained underwear and towels from leaks.

A [pee chee cheex] multipack is just under $150. So naturally, switching to a multipack pays for itself over and over again.

Not wasting feels good. But being ready for anything your vagina throws at you… that’s the game-changer.

So…

One Pair Will NOT Do It

Sure, one pair might get you started, but it’s not enough for your whole period. Imagine running out mid-cycle—scrambling back to disposables? No thanks!

That’s why a multipack gives you freedom and confidence for your entire cycle—whether it’s a light day or a heavy one. Never worry about running out or having to go backwards and resort to disposables – again!

You Can’t Get Simpler

Think about it: with a multipack, you’ll always have a fresh pair ready. No more last-minute panics, no more waiting for that one pair to dry. Just grab, wear, and go.

It’s like slipping into your comfiest undies, but with built-in period protection.

When it’s this easy, can you really imagine going back?

You Don’t Need to Make Trade-offs

Let’s be real: you don’t need to juggle tampons AND pads just to feel safe. [pee chee cheex] multipacks gives you full, comfortable, leak-proof protection. No more juggling multiple items. No more panty liners. Get peace of mind that comes with reliable protection, in one product.

Here’s where it gets even better: by choosing Pee Chee Cheex,

You’re Embracing a Natural Solution

…that doesn’t stick around for centuries like disposables do. When you Switch & Save with multipacks, you’re not just saving money—you’re saving the planet. Each pair is 85% compostable and biodegradable, ensuring that when they’re done, they return to the earth instead of polluting it for generations.

Every small step adds up. Start today - choose one multipack here and join [pee chee cheex] community - making a real difference, one period at a time.

Merindah Hi-Waist Regular Heavy

How it works

Merindah Hi-Waist Regular Heavy

Sold out
$47.99
MODERATE absorbency MODERATE absorbency for regular flow days.
Size
Color: Black Factory Seconds

Notify me when back in stock


⚠️ STOP! Read This Before Making Your Purchase. Click Here.


Why These Are Literally Life-Changing

  • ✔ 360° Leakproof Quad Barriers: Our patented designs prevent leaks, even at the sides where others fail.
  • ✔ Up to 8 Tampons of Absorbency: Holds more flow, keeping you fresh and dry all day / all night.
  • ✔ Ultimate Comfort & Fit: Two layers of Lenzing Modal fabric-body add softness and strength. They also hide stitching for a smooth look.
  • ✔ Natural & No-Added Chemicals: The absorbent core is made from bamboo and cotton, so it naturally controls odour.
  • ✔ Eco-Friendly & Sustainable: 85% biodegradable and compostable. Great for the planet.

How it works

Overview

No undie protects like [pee chee cheex] ...or feels like them.

Conquer your day with [pee chee cheex] innovative features, leakproof quad barriers with extra thigh gap protection, a super absorbent core with natural odour control, natural fabrics gentle to the skin and dual layers of premium stretch fabric.

360° Leakproof Quad Barriers

Our patented designs prevent leaks, even at the sides where others fail.

Up to 8 Tampons of Absorbency

Holds more flow, keeping you fresh and dry all day / all night.

Ultimate Comfort & Fit:

Two layers of Lenzing Modal fabric-body add softness and strength. They also hide stitching for a smooth look.

Natural & No-Added Chemicals

The absorbent core is made from bamboo and cotton, so it naturally controls odour.

We design our products to actually work without adding chemical treatments for moisture management or odour control. Our designs exclude nasties like PFAS, PFOA, PFCs, Phthalates, and Volatile Organic Compounds. Additionally, our undies undergo thorough testing by a top global company to ensure quality.

We care deeply about this issue, so we set our own standards higher than the Oeko-tex Standard 100 requirements. Why? Because our undies are made from love, for loved ones.

Be protected and comfy

Making the most uncomfortable time of the month comfortable. Our undies are soft and strong with two layers of Lenzing Modal fabric. The stitching is hidden for a smooth look.

And, not only is it comfortable and protective, it’s...

Eco-Friendly & Sustainable

If you want a game changing new way to period you can kiss those single-use disposable panty liners, tampons, and pads goodbye.

Best part: they are 85% biodegradable and compostable (remaining 15% includes trimmings like elastics). Great for the planet.

So, Switch & Save some moolah and save the planet with multipacks for all-cycle protection without running out of undies or dealing with daily laundry.

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Performance Features

Comfort Features

Lifestyle Features

Eco Friendly Features

FAQs

Why do [pee chee cheex] undies work so well?+
Pee Chee Cheex are designed as a complete system. Every piece works together in balance. Just as nature intended.

At the core, a super absorbent layer draws fluid away from your skin and locks it away. Around it, our patented 360° quad-barrier protection is formed through the combination of physical leak barriers and built-in Air Channels woven between layers, so airflow moves naturally through the fabric — without relying on bonded adhesives. This helps reduce moisture and protect exactly where it matters.

Unlike traditional designs, our construction avoids the common stitching flaws found in many period undies, particularly around the gusset and leg seams. This is where leaks and discomfort often occur.

We don’t just claim performance — we show it.
Our absorbency and leakproof protection are demonstrated in real-time video testing, so you can 👉 see exactly how Pee Chee Cheex perform under pressure [click] .
What size shall I buy?+
Before you buy, we recommend you always check our Size Chart here.
How much flow can [pee chee cheex] absorb?+
Our [pee chee cheex] period undies come in different levels of absorbency, from Regular-Heavy, which can handle up to 8 regular tampons worth of flow, to Super-Heavy, which can take care of up to 12 regular tampons worth of flow. So, you're sorted for every day of your cycle, no matter how heavy or light your flow is.

To make sure you get the most out of your [pee chee cheex] undies, we recommend trying them out at home first so you can see how they work. Once they start feeling damp, it's time to change into a fresh pair.

We suggest grabbing a multipack of 7 undies so you're always sorted during your cycle. Who wants to do extra laundry during that time, am I right?

Plus, we've got Switch & Save Packs that let you build up your [pee chee cheex] collection and save some 'moolah' over the lifetime of your periods. So go ahead, give them a go and experience how much easier and comfier your period can be with [pee chee cheex]!
How easy is it to care for [pee chee cheex]?+
Looking after your [pee chee cheex] undies is a breeze. Once you feel a bit damp, just swap into a fresh pair. Then rinse the worn pair in cold water (until clear) to remove most of the blood, and pop them in a mesh bag to wash.

To keep your [pee chee cheex] undies in tip-top condition, wash them in cold water on a gentle cycle and hang them out to dry. It's that simple!

To make sure they last as long as your regular undies and work at their best, avoid bleach, fabric softeners, and the dryer.

If you want them to dry faster, flip them inside out with the gusset facing out and hang 'em up in the shade with a good breeze.

To save water, instead of running the tap for ages, rinse 'em in a washing bucket while you're having a shower, or save a few pairs to wash all at once. Easy as, and you'll do your bit for the planet too!
How long can I wear [pee chee cheex] period undies before I change them?+
Every body and every flow is different. But many women, especially on heavier days, find they can rely on Pee Chee Cheex for far longer than other period underwear — without needing backup pads or tampons, so you can get on with your day without the constant checking.

Our highest absorbency styles hold up to 12 tampons’ worth of fluid — and we show it in real-time testing, so you can 👉 see exactly how they perform [click] . In fact, we stopped testing at that point because they were fully saturated — and still didn’t leak. For most women, that’s more than a typical day’s flow.

If you’re new to us, start by wearing them at home and notice how much longer you can go compared to your usual period product, then adjust from there.

The super absorbent core locks everything away, while the top layer draws moisture away from the surface. So you’re not dealing with that wet pad feeling sitting between your thighs.

How long you wear them comes down to your flow, and how fresh you want to feel. On lighter days, you may only need one pair. On heavier days, you might prefer to change more often. You’ve got the flexibility.

A simple rule? If you start to feel damp, it’s time to change into a fresh pair.

Our tip? Start with a 7-pack. It gives you enough pairs to rotate comfortably, without feeling like you’re constantly washing or caught short.
How quick will I get my exchanged product?+
We totally get that you're stoked to get your hands on your new Pee Chee Cheex undies and we want you to receive them ASAP too! Our team processes exchange orders within 1-2 business days after receiving your return (unopened, unworn, unwashed).

Packages are shipped via Australia Post, which usually takes 3 - 7 business days to arrive (includes packing and posting). We want you to be completely happy with your Pee Chee Cheex purchase, so if you need to make an exchange, we've got you covered with some easy steps 👉 here [click].
Where is the super absorbent gusset positioned?+
Wanna know what makes [pee chee cheex] period undies different? Our undies come with a super absorbent gusset that's designed to keep you protected while feeling thin and comfy around your legs.

Unlike pads that move around and shift out of place, the patented Aussie design stays in place no matter what you do. The super absorbent core is placed between your legs and covers your vulva, giving you full coverage and leak protection.

We've even extended the protective base barrier all the way up to the rear waistband elastic so you can sleep like a baby worry-free.

Our super absorbent core has a bigger surface area covering higher and wider up the front and rear, making them way more comfortable. And don't worry about any adhesives in that sensitive area; we got you covered.

The patented technology locks away your flow with quad barriers to protect against leaks at the thigh gap area, giving you maximum protection against unwanted stains.

So why wait? Try out [pee chee cheex] and see how much easier and more confident your period can be!
Got More Questions?+

Head over to our FAQS to get more answers.

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Switch & Save Multipacks backed by our 100% Risk-Free Guarantees