The 8 Best PFAS-Free Period Underwear Brands (Non-Toxic & Sustainable)
- Valinda
- Apr 1
- 10 min read
Updated: Apr 4
What if the products you trust every month are quietly exposing you to harmful chemicals—and creating mountains of waste along the way?
Conventional pads and tampons are not only single-use and landfill-bound, but many also contain traces of PFAS, known as “forever chemicals” linked to serious health concerns. These substances can hide in the very items marketed as “clean” or “leak-proof.”
But there’s good news: there’s a safer, sustainable option that’s gaining serious traction—period underwear. And when chosen wisely, it can offer all-day comfort, zero waste, and peace of mind.
In this post, we’ll break down:
How period underwear works
Why PFAS-free options matter
Which non-toxic brands to trust
How it compares to cups and cloth pads
And exactly how to care for your period underwear so it lasts for years.
If you’re ready to switch to a non-toxic, low-waste period routine, you’re in the right place.
What Is Period Underwear & How Does It Work?
Period underwear is specially designed underwear that absorbs menstrual blood, often replacing or supplementing disposable products like pads and tampons. From the outside, it looks and feels like regular underwear—but the technology hidden in the layers is what makes it unique.
Most period underwear features multiple built-in layers that each serve a specific function:
A moisture-wicking layer to keep you feeling dry
An absorbent core that traps and holds blood
A leak-resistant barrier that prevents staining your clothes
These layers work together to absorb anywhere from one to five tampons’ worth of blood, depending on the brand and style. Some options are made for light spotting, while others are built for heavy flow days or overnight use.
Unlike traditional period products that you toss after a few hours, you can wash and reuse period underwear for years, making it both a sustainable and cost-effective choice.
Whether you wear them as your sole protection or as backup with a menstrual cup or tampon, period underwear offers a more comfortable and eco-conscious way to manage your cycle. And when you choose a pair that’s free from PFAS and other harmful chemicals, you’re also protecting your long-term health.
The Toxic Truth: PFAS in Period Underwear
While period underwear has gained popularity as a more comfortable and eco-friendly alternative to traditional menstrual products, not all options are created equal. Many unsuspecting users have discovered that some brands contain PFAS, or per- and polyfluoroalkyl substances—a group of synthetic chemicals often referred to as “forever chemicals” due to how long they remain in the environment and the human body.
What Are PFAS and Why Are They Harmful?
PFAS are used in a wide range of consumer products to make them water- and stain-resistant, including nonstick cookware, rain jackets, and unfortunately, some period underwear. While this may sound convenient, research has linked long-term exposure to PFAS with serious health issues such as:
These substances don’t break down easily, meaning they accumulate over time in your body and the environment, contributing to long-term health and ecological concerns.
How Do PFAS End Up in Period Underwear?
In period underwear, PFAS are sometimes added to the absorbent layers or outer fabrics to provide moisture-wicking or leak-proof performance. The problem? These chemicals can come into direct contact with sensitive skin and may enter the body through dermal absorption or mucous membranes—especially concerning when used repeatedly over long periods.
Several studies and lawsuits in recent years have brought attention to the presence of PFAS in period underwear, even in products labeled as "natural" or "organic." This has prompted growing demand for transparency and PFAS-free period underwear.
What to Look for Instead
If you’re seeking a non-toxic, safe alternative, it’s crucial to look for PFAS-free certifications or brands that explicitly state they do not use intentionally added PFAS. Some reputable brands even conduct independent third-party testing to verify the absence of these chemicals.
Choosing PFAS-free period underwear not only supports your personal health but also aligns with a broader commitment to sustainability and environmental responsibility.
Benefits of Using Period Underwear
Making the switch to period underwear isn’t just a trend—it’s a practical, long-term solution for those seeking non-toxic and sustainable menstrual care. Whether you're new to eco-friendly living or simply want to ditch disposables, here are the key reasons this reusable option is worth considering.
1. Better for the Environment
The average person uses over 10,000 pads or tampons in their lifetime—most of which end up in landfills or oceans. Period underwear is reusable for years, dramatically reducing your monthly waste and carbon footprint. It’s a simple step with a significant impact.
2. PFAS-Free and Non-Toxic Options Exist
One of the biggest concerns with conventional period underwear is the presence of PFAS—a group of harmful chemicals used for stain and water resistance. Thankfully, many reputable brands now offer PFAS-free period underwear, clearly lab-tested and certified. By choosing these non-toxic period underwear options, you’re prioritizing your health while staying protected.
3. Comfortable and Breathable
Unlike plastic-backed pads or synthetic tampons, period underwear is designed with soft, breathable fabrics that move with you. Many brands use organic cotton or moisture-wicking layers to keep you dry and comfortable, even on heavy days. No chafing, no bunching—just reliable comfort.
4. Cost-Effective Over Time
While the upfront investment may seem higher, a few pairs of high-quality period panties can last up to 2–3 years with proper care. Compared to the ongoing cost of disposable products, this swap can save hundreds of dollars in the long run.
5. Less Hassle, More Freedom
No more worrying about changing a pad every few hours or carrying tampons around. With the right absorbency level, you can wear period underwear for up to 8–12 hours—making it ideal for work, sleep, or travel. It’s a game-changer for convenience and peace of mind.
How It Compares to Other Sustainable Period Products
Period underwear is just one option in a growing lineup of sustainable period care alternatives. But how does it really stack up when compared to menstrual cups, cloth pads, or organic tampons?
Here’s a breakdown to help you decide which solution best fits your needs:
Product Type | Best For | How It Works | Pros | Cons |
Period Underwear | Beginners, light/medium flow | Built-in absorbent layers collect menstrual fluid, worn like regular underwear | - All-in-one, no extra parts - Comfortable and breathable - PFAS-free options | - Multiple pairs needed for full cycle - Higher upfront cost |
Menstrual Cups | Experienced users, heavy flow | Inserted into the vagina, collects fluid for 8–12 hours | - Long-lasting (up to 10 years) - Holds more than other options - Zero waste | - Steep learning curve - Not suitable for everyone |
Cloth Pads | External protection, sensitive skin | Snap onto underwear and absorb fluid like disposable pads | - Reusable and soft - Affordable over time - Variety of sizes/fabrics | - Can shift during wear - Bulkier feel - Requires changing on the go |
Organic Cotton Tampons & Pads | Transitioning from disposables | Same use as conventional products, but made from organic, chemical-free materials | - Familiar and easy to use - Better than standard disposables - Readily available | - Still single-use - More expensive than non-organic - Often plastic packaging |
While all these options are far more sustainable than traditional pads and tampons, period underwear stands out for its simplicity, comfort, and ability to seamlessly fit into daily life. It’s especially ideal for beginners looking to reduce waste and exposure to harmful substances like PFAS—without the need for complicated routines or internal products.
Still unsure? Many people find that combining two or more options (like a menstrual cup with period underwear as backup) offers the best of both worlds.
How to Wash and Care for Period Underwear
One of the biggest concerns people have when switching to period underwear is maintenance. The good news? Washing and caring for period underwear is easier than you might think—and a few simple habits can help your underwear last for years while maintaining hygiene and absorbency.
Rinse After Use
After wearing, give your period underwear a quick rinse in cold water to remove excess blood. This step helps prevent staining and prepares the fabric for machine washing. It’s best to rinse them as soon as you take them off, but if you’re short on time, letting them soak in cold water for an hour works well too.
Machine Wash Cold
Once rinsed, machine wash your period underwear on a cold cycle with like colors. Cold water is essential—it helps preserve the absorbent layers and prevents protein-based stains from setting. Use a gentle, fragrance-free detergent to protect both your skin and the integrity of the fabric.
Avoid:
Hot water, which can damage the moisture-wicking layers
Fabric softeners, which coat the fibers and reduce absorbency
Bleach or harsh chemicals, which break down fabrics and may irritate sensitive skin
Skip the Dryer
Air drying is your best friend. Tumble drying may compromise the waterproof barrier or shrink the fabric, reducing the effectiveness of your period underwear over time. Lay them flat or hang them up in a well-ventilated space. Most high-quality brands are designed to dry quickly, so this step won’t take long.
How Often Should You Wash Them?
Just like regular underwear, period panties should be washed after each use. If you're building a zero-waste period routine, investing in 4–6 pairs will help you comfortably cycle through them while allowing time for washing and drying.
Storage Tips
Once dry, store your period underwear in a clean, dry drawer—preferably one that doesn’t collect too much heat or moisture. You can even separate them from your regular underwear to help keep track of which pairs are reserved for your cycle.
Knowing how to wash and care for period underwear properly not only keeps them clean and safe to wear, but it also extends their life—saving you money and reducing waste. With the right routine, your sustainable period solution becomes even more eco-friendly.
The Best PFAS-Free Period Underwear Brands
Not all period underwear is created equal. While the concept is eco-friendly and convenient, not every brand is transparent about what’s actually in their products. Some have been found to contain PFAS (per- and polyfluoroalkyl substances)—a group of synthetic chemicals linked to hormonal disruption, immune issues, and long-term environmental harm.
That’s why it’s critical to choose PFAS-free period underwear from brands that prioritize safety, sustainability, and transparency.
Here are some of the best PFAS-free period underwear brands you can trust:
Saalt Wear
Saalt is best known for its menstrual cups, but their period underwear is equally impressive. All fabrics are OEKO-TEX® certified and designed for comfort and breathability, while keeping you safe from harmful substances like PFAS.
Price range: $29–$48 USD
Size range: XS to 2XL
Absorption: Up to 3 regular tampons' worth (moderate flow)
Why we like them:
Certified non-toxic and sustainably made
Sleek, minimalist designs
Donates 2% of revenue to period care initiatives
Knix
Knix has stated they do not intentionally add PFAS to their underwear, and recent updates have improved their material safety. While third-party test results aren’t always published, Knix remains a popular brand with solid sustainability messaging.
Price range: $23–$38 USD
Size range: XS to 4XL
Absorption: Up to 8 tampons' worth (ultra-heavy flow)
Why we like them:
Excellent for postpartum or overnight use
Inclusive sizing and modern styles
Leakproof technology with no added PFAS
Period.
Designed to be affordable and inclusive, Period. offers PFAS-free period underwear made with certified organic cotton. Their mission-driven approach also supports menstrual equity and education for young people.
Price range: $12–$25 USD
Size range: XS to 3X
Absorption: Up to 2–4 tampons' worth (light to moderate flow)
Why we like them:
One of the most affordable PFAS-free options
Transparent about ingredients and materials
Donates period products through social initiatives
Bambody
Bambody is an affordable Amazon-available brand that prioritizes comfort, performance, and safety. Their latest versions are marketed as PFAS-free and use bamboo fabric for breathability.
Price range: $12–$22 USD
Size range: XXS to 2XL
Absorption: Up to 4 tampons' worth (moderate flow)
Why we like them:
Low price point and easy access via Amazon
Great for trying period underwear without a big investment
Comfortable waistband and everyday feel
Cora
Cora is a well-known U.S. brand offering a range of period products made with clean ingredients. Their period underwear is free from PFAS and other harmful chemicals, with fabrics that are OEKO-TEX® certified. Cora focuses on comfort, performance, and socially responsible sourcing.
Price range: $22–$38 USD
Size range: XS to XL
Absorption: Up to 3 regular tampons' worth (moderate flow)
Why we like them:
OEKO-TEX® certified and PFAS-free
Sleek, barely-there feel
Every purchase helps donate pads to girls in need
TIICHOO
TIICHOO offers affordable, reusable period underwear made from breathable cotton and designed for heavy flow and overnight protection. The brand confirms their products are PFAS-free, making them a safer choice for long-term use.
Price range: $16–$30 USD (multi-packs available)
Size range: S to XXL
Absorption: Up to 4–5 tampons' worth (moderate to heavy)
Why we like them:
Excellent value and budget-friendly
High-waisted, full-coverage styles
Verified PFAS-free and skin-safe
Strawberry Weeks
Strawberry Weeks focuses on creating PFAS-free period underwear for teens and young people. Their designs are colorful, comfortable, and provide reliable protection for early cycles or school days.
Price range: $18–$28 USD
Size range: Youth XS to Adult L
Absorption: Up to 2–3 tampons' worth (light to moderate flow)
Why we like them:
Safe, beginner-friendly option for teens
Soft waistband and gentle fit
No harmful chemicals or irritants
EcoPeriod
EcoPeriod offers a range of PFAS-free period underwear made with organic cotton and leakproof barriers. Their products are washable, sustainable, and designed for comfort during everyday wear or sleep.
Price range: $20–$32 USD
Size range: S to 2XL
Absorption: Up to 4 tampons' worth (moderate to heavy)
Why we like them:
Eco-conscious materials and packaging
Focus on washable, long-lasting protection
Verified PFAS-free and good for sensitive skin
When shopping for the best PFAS-free period underwear brands, look for transparency, certifications like OEKO-TEX® or GOTS, and clear labeling around PFAS testing. Just because a product is reusable doesn’t always mean it’s non-toxic.
Final Thoughts: Choose a Safer, Smarter Period
Switching to PFAS-free period underwear isn’t just about convenience—it’s a conscious decision to protect your health and reduce your environmental footprint. With growing awareness about the hidden chemicals in everyday products, it’s more important than ever to choose non-toxic, transparent brands that prioritize your well-being.
Whether you’re new to reusable period products or looking for a safer upgrade, period underwear offers a practical, low-waste solution that’s comfortable, cost-effective, and better for the planet. And with more brands committing to PFAS-free, certified-safe materials, you no longer have to choose between performance and peace of mind.
From heavy-flow protection to lightweight liners, there’s an option for every body—and every budget.
Ready to make the switch? Explore the PFAS-free brands we’ve covered in this post and take the first step toward a cleaner, healthier period—one that supports both your body and the environment.
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