Why We Don't Think Period Underwear Should Be 100% Cotton
Written by Angelica Raras Anindiati Ningtyas
Period underwear isn't the same as your everyday underwear.
When people first discover period underwear, one of the first questions they ask is:
"Is it made from 100% cotton?"
It's a fair question. Cotton has long been associated with comfort, breathability, and sensitive skin. Naturally, many people assume the more cotton, the better.
But period underwear isn't the same as your everyday underwear. It has a much bigger job to do. Besides feeling comfortable against your skin, it also needs to absorb menstrual flow, prevent leaks, and stay comfortable throughout the day.
That's why we don't believe period underwear should be made from 100% cotton alone. Instead, we believe every layer should have a specific purpose.
What Would Happen If Period Underwear Was 100% Cotton?
Cotton is an excellent natural fiber, but like every material, it has strengths and limitations. If period underwear were made entirely from cotton, you might notice:
It takes longer to dry
Cotton naturally holds onto moisture. While it's soft against the skin, it also takes longer to dry after absorbing liquid or after washing. For reusable products that you'll wear and wash regularly, drying time matters.
It may struggle to prevent leaks
Absorbing liquid is only part of the equation. Period underwear also needs a waterproof barrier that keeps menstrual flow from reaching your clothes. Cotton alone can't provide that protection.
It can become thicker and bulkier
To achieve the same absorbency using only cotton, the underwear would likely need multiple thick layers. That means a bulkier fit that may not feel as comfortable under everyday clothing.
Period Underwear Has More Than One Job
Unlike regular underwear, period underwear needs to perform several functions at the same time.
It should:
✔ Feel soft against your skin
✔ Absorb menstrual flow
✔ Help prevent leaks
✔ Stay comfortable for hours
✔ Remain breathable throughout the day
No single material can do all of those jobs perfectly. That's why high-quality period underwear combines different fabrics, each chosen for a specific purpose.
What's Inside Perfectfit Period Underwear?
At Perfectfit, every layer is thoughtfully designed to do one job well.
Layer 1 - The Layer That Touches Your Skin
95% Cotton + 5% Spandex
This is the layer you'll actually feel. Cotton provides softness and breathability, while a small amount of spandex allows the underwear to stretch comfortably and fit your body better.
Layer 2 - The Absorbent Layer
100% Cotton + Quick Dry French Terry
This layer absorbs menstrual flow while helping moisture spread evenly, keeping the surface feeling drier for longer.
Layer 3 - The Leak-Proof Layer
Polyester + PU Coating
This layer acts as a waterproof barrier, helping prevent leaks from reaching your clothes. Importantly, this layer does not sit directly against your skin. Its job is simply to provide reliable leak protection.
Is Polyester Safe in Period Underwear?
This is one of the questions we hear most often. The answer isn't simply about whether polyester is "good" or "bad." The more important question is:
Where is it used?
In Perfectfit period underwear, polyester is used only in the waterproof layer, not in the fabric that touches your skin. The inner layer that sits against your body is made primarily from cotton for softness and breathability.
Using polyester in the waterproof layer allows period underwear to provide leak protection without sacrificing comfort.
Why Material Placement Matters More Than Material Alone
Imagine if period underwear were made from only one fabric. It might feel soft, but it wouldn't absorb as well. Or it might absorb, but stay damp for longer. Or it might prevent leaks, but feel bulky. That's why different layers exist. Each one solves a different problem, so together they give you a better experience.
Choosing Period Underwear Isn't About Finding "100% Cotton"
It's about finding period underwear that's thoughtfully designed. At Perfectfit, we believe your period products should help you think less about leaks, discomfort, and constant replacements, and more about living your life. That's why every layer is carefully chosen to support your body, your comfort, and your confidence. Because better period care isn't about one magic material. It's about thoughtful design.
Using polyester in the waterproof layer allows period underwear to provide leak protection without sacrificing comfort.
Frequently Asked Questions
Is 100% cotton period underwear better?
Not necessarily. Cotton is excellent for softness and breathability, but period underwear also needs absorbent and leak-proof layers. Different materials work together to provide comfort and protection.
Is polyester safe in period underwear?
Yes, when it's used appropriately. In Perfectfit period underwear, polyester is only used in the waterproof layer and does not directly touch your skin.
What is the best material for period underwear?
The best period underwear combines multiple materials, each chosen for a specific purpose: comfort, absorbency, stretch, and leak protection.
Can reusable period underwear help reduce waste?
Yes. Unlike disposable pads, reusable period underwear can be washed and worn repeatedly for years, helping reduce single-use menstrual waste while saving money over time.
Final Thoughts
Still curious about reusable period underwear?
Explore Perfectfit's collection of thoughtfully designed period underwear, reusable pads, and menstrual cups, created to be kinder to your body, your wallet, and the planet. 🤍