Female Engineering + Mammut put female confidence first — every day of your cycle. Tested and proven for high performance, these period panties are designed to keep your periods safe.
If you want to know more about our collab partner Female Engineering check out their website here: https://www.femaleengineering-official.com/
How do Period Panties work?
Our period-proof underwear are reusable garments designed to absorb menstrual blood, prevent leaks, control odour, and wick moisture.
This is made possible by the absorbent gusset made with the by Female Engineering patented three-layer Engineered Leak Tech™. It is a built-in period protection that absorbs your menstrual blood, prevents leaks, controls smell, and wicks moisture.
Using period underwear is very similar to wearing regular underwear, but with built-in period protection. You can wear them throughout the day without worrying about leakage, discomfort, or odour.
Why do period underwear cost more than regular underwear?
While our period panties feel just as comfortable as regular ones, they offer much more in terms of design and technology, which is why they are priced higher.
Firstly, the period panties use a by Female Engineering patented Engineered Leak Tech™ technology. This technology has been rigorously tested and refined over several years with their innovation partners. It features three high-performance layers that provide excellent absorption and leak protection. These advanced materials are more costly to produce compared to standard fabrics.
Additionally, the materials are both sustainable and durable. They are designed to last a long time, effectively absorbing fluids and preventing leaks for years, making them a long-term investment in quality and comfort.
Is the period underwear tested by consumers? What feedback have you received?
Yes, the period underwear undergoes thorough testing through:
1. Independent testing: Verified by third-party test institutes using industry-standard methods.
2. Expert evaluation: Reviewed by femcare scientists, textile engineers, and material and fit specialists.
3. Real user feedback: Female Engineering involves real women in weartrials, collecting their feedback to refine our products. For instance, the period panty was tested by women on three separate occasions throughout its development.
Female Engineering conducted extensive wear trials, and hundreds of women have helped us optimise the final version. The response has been very positive:
• High satisfaction: Most testers are eager to keep using them.
• Leak-proof experience: The majority report no leakage at all.
• Preferred over disposables: Rated higher than disposable products on 10 out of 11 factors, with top scores for reliability, comfort, and reduced need for changing.
• Easy care: Most find washing and handling to be straightforward.
•Highly recommended: All testers are willing to recommend the product to others.
Can I wear the period panty as a swimwear ?
You can absolutely wear your period panty on the beach and swim in it if you want to — it won’t be damaged by occasional use in water.
However, the outer material is not designed for swimming, chlorinated water, sun exposure or sand. Because of this, the absorption and performance may not work as intended when used in water.
For the best comfort, durability and protection in water, we recommend using our period swimwear, which is specially developed for swimming and water activities.
What differs Female Engineering’s period underwear from other competitors?
Female Engineering’s period underwear stands out due to several key features:
1. Fit
The fit is crucial for preventing leaks. We’ve developed a “second-skin” fit, perfected through extensive research and analysis of how the female body moves. This ensures maximum comfort and leak prevention in every situation, whether you're sitting, standing, walking, or running. Our period underwear is made from high-quality, durable, sustainable materials that are designed to last through years of wear and washing.
2. Coverage
We’ve carefully designed the gusset’s length, width, and shape to ensure optimal coverage. Women bleed differently, so we made sure our underwear provides full protection, even for those with varying flow patterns or when sleeping.
3. Engineered Leak Tech™
Our period-proof underwear features a by Female Engineering patented, multi-layered Engineered Leak Tech™ technology in the gusset, making it completely leak-proof for all-day protection.
4. Consumer Testing & Feedback
The products have been tested by hundreds of women in real-world wear trials. Their feedback has helped us refine and perfect our period underwear, resulting in overwhelmingly positive reviews.
Do period underwear replace disposables such as pads, liners, and tampons?
Yes, our period-proof underwear is designed to fully replace disposable products like pads, liners, and tampons. It can hold enough fluid to keep you completely safe throughout the day. Wear trials have shown that it’s not necessary to use any additional products when wearing our period underwear.
However, if preferred, you can still combine the underwear with disposables for extra protection. For example, when using tampons, our period underwear with lower absorbency (5 or 10 ml) can be worn as a backup in case of leakage.
Should I combine period panties with other menstrual protection?
Our period-proof underwear are designed to be worn on their own, as long as the absorbency level matches your flow. They will keep you dry and secure all day, without the need for additional menstrual protection.
However, some people prefer to combine the period panty with other menstrual products throughout their cycle for extra peace of mind. This is a personal choice, and we encourage you to experiment and find what works best for you.
Will it be available in multiple sizes? How does the sizing run?
Yes, our period-proof underwear comes in a wide range of sizes to fit various body types.
• For women: XS, S, M, L, XL
Sizing: Keep in mind that the period underwear is designed to feel snug at first but will relax after washing and repeated wear, ensuring a perfect fit. Similar to Jeans.
What kind of materials are the period panties made of?
The period panties are made from a combination of sustainable and certified materials:
Recycled Polyamide Range:
• 83% of the fabric is recycled polyamide.
• The fabric is RCS Global Recycling Standard certified and OEKO-TEX Standard 100 certified.
To achieve the right elasticity, we use low-cure silicone.
How do I know when it’s time to change period panties?
Our period panties are designed differently from tampons or pads. You don’t need to change them during the day as they don’t "get full" in the same way. Instead, you choose the right absorbency level for your flow, and you can wear them all day or night.
• Absorbency: Our most absorbent period panty can hold up to 50 ml, which is more than most women bleed during an entire period (average 35 ml). While it’s unlikely the panty will reach capacity in one day or night, if it does, you may need a higher absorbency level.
Signs to look out for (if you have a very heavy flow):
• Weight of the gusset: Heavier means fuller.
• Trace on the wicking layer: Check the inner layer for signs of moisture.
• Stiffness: A full gusset might feel thicker and stiffer than when newly washed.
Over time, you'll learn how long you can wear a specific absorbency based on your unique flow.
Is the period panty leak-proof for heavy bleeding?
Yes, our period-proof underwear is designed to be leak-proof, even for heavy bleeders.
If you're concerned about heavy bleeding, we recommend trying the period panty at home during a heavy flow day. This will give you the opportunity to test its performance and find the best fit for your needs. And if you are on the go, always keep an extra pair with you if you feel like changing.
How many period panties will you need?
Our period-proof underwear are designed to be reusable and machine-washable, making them a sustainable option for your menstrual cycle. We recommend starting with 3-5 pairs to ensure full coverage for an entire period without too much laundry.
However, the number you need may vary based on factors such as your flow and laundry habits. Some people prefer starting with just 1-2 pairs to complement their usual sanitary products, which can be a great way to ease into using period underwear and figure out what works best for you.
Are Period Underwear Safe to Use Overnight?
Yes, period-proof underwear is safe to use during the night.
For most people, the regular period panties work perfectly fine during sleep.
Can I Put My Period Panties in the Dryer?
While putting your period panties in the dryer once or twice won’t cause any major issues, frequent tumble drying may impact their performance and structure over time. To maintain their longevity and effectiveness, it's best to avoid use of the dryer.
How Long Does It Take to Hang Dry Period Panties?
Under normal conditions, it typically takes about 10-12 hours for period panties to air dry. However, drying time can vary depending on factors like humidity, air circulation, and the absorbency level of the panty. Panties with higher absorbency will have thicker gussets, which may take a bit longer to dry. Do I Need to Wash My Period Panties Immediately After Use?
We recommend rinsing your period panties right after use and then letting them hang dry. You can wash them whenever it’s convenient for you, and in the meantime, feel free to store them in your laundry basket along with your other clothes.
To help extend the lifespan of your panties, we suggest using a laundry bag for extra care.
Will My Period Panties Stain My Other Clothes?
No, the washing machine will dilute the blood almost instantly, so it won't stain any of your other clothes. Your other garments will be perfectly fine!
How to take Care of Your Period Underwear After Use:
Handling period underwear is similar to regular underwear:
1. Rinse the underwear immediately after use.
2. Wash them at 40°C with other garments.
3. Avoid using fabric softener or tumble drying.
4. Hang dry your period panties inside out for best results.
The only extra step compared to regular underwear is the pre-rinsing.
Are Female Engineering´s period panties treated with anything?
Yes, the period panties have a treatment in the absorbent gusset to prevent odour.
All Female Engineering period panties are certified by OEKO-TEX®, which means that the products have been evaluated for the content of substances harmful to health and are safe to use.
Why is a treatment in the gusset needed?
Surveys and conversations with customers show that fear of unwanted odour is one of the biggest concerns when it comes to trying period panties. To address this, Female Engineering included an odour treatment.
Are the period panties free from PFAS substances?
The period panties are made without any treatment of PFAS or PFAS-related substances. Female Engineering has verified this by testing it for PFAS and PFAS-related substances according to OEKO-TEX standard 100 class I, using the currently best available method.
How Long Do Period Panties Last and How Many Washes Are They Good For?
Our period panties are guaranteed to last at least 50 washes, which is above industry standards. While the absorption layer's odour control properties may decrease slightly after 50 washes, the panty’s fabric, form, and fit are designed to last much longer. With regular use and washing once per menstrual cycle, your period panties should last around 4 years.
How Many Hours Can I Wear Period Panties?
Our period-proof underwear are tested for up to 12 hours of use. However, some women have worn them for up to 24 hours without experiencing any leakage, as our underwear have a high capacity to hold menstrual blood. The key is to choose the right absorbency level based on your flow Can I Wear Period Underwear Postpartum?
Our period panties are great for taking care of your post‑partum needs once the initial, heavy phase after giving birth has passed. When the bleeding has stabilized, remember to always keep a close eye on the condition of your post‑partum bleeding, as it is an important indicator of your uterus’s health. If you need to change after just 1–3 hours (depending on the panty’s absorption level) or have any other concerns, always consult medical care first.
How Does Period Underwear Prevent Leakage?
This period underwear is designed with a by Female Engineering patented multi-layered Engineered Leak Tech™ technology, making it completely leak-proof.
This advanced technology features three layers, each serving a distinct purpose:
• Wicking Layer: This layer efficiently transports blood to the absorbent layer while keeping the surface dry and in contact with your body.
• Absorbent Layer: This layer securely holds the blood, with added odour control treatment for freshness.
• Barrier Layer: The barrier layer prevents leakage while remaining breathable.
In addition, the underwear is designed with a perfect fit to ensure the Engineered Leak Tech™ gusset stays in place, optimizing its performance. Without this precise fit, the technology wouldn’t function as effectively.
Together, these layers and the perfect fit work to keep our period underwear safe and leak-proof.
What Are the Absorbency Levels of Our Period Proof Underwear?
Our period-proof underwear comes in a variety of absorbency levels, similar to disposable menstrual products, so you can choose the perfect fit for your flow.
Here’s a breakdown of the absorbency levels:
• 20 ml Medium ≈ 2 tampons/pads
• 40 ml High ≈ 4 tampons/pads
Based on a light panty liner, normal-sized tampon, and normal-sized pad.
I have a heavy flow. Which of your period panties would be sufficient?
For heavy flow, we recommend our high absorbency panty.
However, for those with exceptionally heavy flow, it's important to note that even the best period underwear may need to be paired with other menstrual protection, like a tampon, for extra security.
If you have concerns about your flow, we recommend consulting a gynecologist or healthcare provider to rule out any underlying issues. Excessive bleeding isn't typical, and it’s always good to check with a medical professional if you notice any irregularities in your cycle.