Period underwear, made from the healthiest, GOTS-certified organic cotton, is reusable underwear worn during menstruation, replacing sanitary pads, tampons and other menstrual hygiene products for women.
Masmi period underwear has been recognized as the best menstrual underwear on the market by independent Allegro experts and other independent rankings – see here:
menstrual underwear ranking (copy link to browser):
- https://allegro.pl/artykul/ranking-majtek-menstruacyjnych-2024–AgMwdkaYeSW
- https://rankedo.pl/majtki-menstruacyjne-ranking/
- https://terdeals.com/pl/ranking/1965/top-5-majtek-menstruacyjnych
Why choose Masmi menstrual underwear?
- 100% organic cotton with GOTS certificate – this is the healthiest material from which period underwear can be made. It means no irritation of intimate areas, inflammations, fungal infections or rashes. The underwear is hypoallergenic.
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Our underwear does not "rustle" when worn, because it contains no foil (polyurethane, polyester, etc.) in the absorbing layer – 100% discretion and mental comfort for you in any situation.
- Guaranteed up to 100 washes without loss of absorption! – As the only company on the market we offer such a guarantee on our underwear. By following the manufacturer’s washing instructions, Masmi underwear will retain its properties even up to 400 washes without loss of absorption.
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Highest absorbency (up to 77 g) – that’s more than 6 super-sized tampons. It guarantees comfort and safety all day or night. No marks on clothing after a whole day at work/school and on bedding in the morning. Best solution during the first periods – high absorbency and long duration of use in combination with the simplest use compared to tampon use or changing a pad give girls an unprecedented level of comfort in these important days – one pair is enough for a whole day at school.
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Excellent for extreme conditions – during training, on a trip, on a plane, while traveling, during long meetings or conferences + all other life situations where changing a pad, tampon or emptying a cup can be problematic – you do not have to give up your plans!
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They are an excellent solution for women after childbirth, for incontinence, discharge and for disabled women – you save time and money with unparalleled comfort of use.
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Eco-friendly – fully biodegradable, no ingredient tested on animals, no superabsorbents, no foil, plastics, artificial fragrances or allergenic ingredients. The best economical choice among all intimate hygiene products!
Q&A
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Is it worth buying menstrual underwear?
Among women who switched from pads, tampons or cups to menstrual underwear, opinions are very positive. Most agree that Masmi underwear passes the test even on the first days of heavy period. Changing a pad or tampon needs to be done every 3-4 hours depending on period intensity – M menstrual underwear only needs to be changed twice a day. We recommend purchasing 2 pairs of underwear – one you wear, the other waiting clean for a change, but if you want to be sure that a clean, washed pair will always be waiting for you on those days, you can get even more pairs. Optimal amount is 3 pcs.
- Do you use pads or tampons at the same time with menstrual underwear?
Menstrual underwear are designed to provide protection on their own during menstruation. There is no need to wear an additional pad, but if you feel more comfortable with a pad, you can use it identically as with normal underwear. You can also wear the underwear for extra protection during menstruation when using a tampon or menstrual cup.
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Are menstrual underwear expensive?
Menstrual underwear are very durable and long-lasting, so their purchase is definitely economical. One pair can serve us for 3 – 4 years without a drop in absorption. By following the manufacturer’s washing and drying guidelines, this period can extend to even 6 years (remember that the underwear can last even longer, but its absorbency will gradually decrease – this process will not be noticeable for you). The cost of buying pads or tampons over a similar period is 3 to 6 times higher (depending on the brand of pads or tampons used) than buying 2-3 pairs of underwear. In addition, there is an incomparably greater comfort of wearing underwear due to a longer interval between changes – 12 h for underwear vs 3-4 h for pads and tampons.
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C]Do menstrual underwear leak?
No, menstrual underwear do not leak if used and cared for properly. However, you should monitor your body and adjust wearing time to your needs depending on the intensity of the period.
- Does menstrual underwear cause a bad odor?
unpleasant odor may appear sometimes when you have a vaginal infection.
- Do you feel damp in menstrual underwear?
If menstrual underwear are washed properly, they do not lose absorbency and should keep up with absorbing moisture into the absorbing layer.

tailored to your body - available in 4 sizes: S, M, L and XL
How to wash and care for the products?
- Wash before first use.
- After use, we recommend rinsing and/or soaking before washing.
- You can wash by hand or in a washing machine with the rest of the laundry or in a separate laundry bag (if you prefer).
- If using a washing machine, wash at a temperature not exceeding 40º.
- For proper care, use neutral soaps. Do not use chlorine, bleaches, fabric softeners, natural oils or Marseille soap, as they may affect absorbency.
- Do not use a tumble dryer, as it may reduce absorbency.
We guarantee constant absorbency of our underwear up to 100 washes!
By following the manufacturer’s washing and drying guidelines, menstrual underwear Masmi will retain its properties even up to 400 washes! Reusable hygiene products provide safety, high absorbency, full freedom of movement, great comfort and at the same time are very economical.
composition:
96% certified organic cotton, 4% elastane
absorbent layer: 97% certified organic cotton, 3% PU
Hypoallergenic product, with as many as 4 certificates: GOTS, FSC, VEGAN and COTTON NATURAL.
in black
vegan-friendly product
made in Spain
NOTE: MENSTRUAL UNDERWEAR SIZES, DEPENDING ON SERIES, MAY VARY SLIGHTLY, THEREFORE IF YOUR MEASUREMENTS ARE BETWEEN TWO SIZES, E.G. S and M, WE RECOMMEND CHOOSING THE LARGER SIZE.
PRODUCT COMES IN A CARDBOARD PACKAGE SEALED WITH A STICKER. UPON OPENING, FOR HYGIENE REASONS, RETURNS ARE NOT ACCEPTED.
In our store you will also find other models of underwear (the composition and technical absorbency parameters of all Masmi underwear models are identical):
- Elegant model – with tulle inserts on the sides of the underwear + lower rise (about 1-1.5 cm)
- Modern model – lower rise (about 1-1.5 cm)
If your periods are very heavy and you need even greater protection, we propose Masmi Reuse menstrual underwear with increased absorbency:
- OF DOUBLE ABSORPTION (up to 120 g) with a low rise
- OF TRIPLE ABSORPTION (up to 166 g) with a high rise,
which you will also find in our store.
Masmi and Silver Care products differ only in external packaging, the product is the same. If one type is out of stock in an order, a replacement from the other brand will be sent.
Manufacturer information
Producer: COHITECH COTTON HIGH TECH, S.L., Colonia La Rabeia, S/n, Balsareny Barcelona, 08-660, Spain, info@masminaturalcotton.com
Exclusion from the right of return and exchange: Intimate hygiene products such as menstrual underwear, pads, pantyliners, tampons, menstrual cups etc., once the packaging has been opened, are not eligible for return or exchange.
Legal basis: Pursuant to Art. 38 of the Consumer Rights Act of 30.05.2014 and EU Directive 2011/83 of 25.10.2011: the right of withdrawal from a contract concluded off-premises or at a distance does not apply to a contract for the supply of goods delivered in sealed packaging which cannot be returned for health protection or hygiene reasons if the packaging has been opened after delivery.
1. How are Masmi period underwear different from other menstrual underwear?
Masmi underwear stands out from the competition thanks to 100% organic cotton with GOTS certification, free from plastic, polyester, or synthetics, which minimizes the risk of irritation and infections (such as vulvitis, TSS), as confirmed by independent lab studies. They offer the highest absorbency (77-166 g vs 25-50 g in other brands) and guarantee absorbency for up to 100 washes (competitors max 60), without any rustling effect when worn or sitting. They are biodegradable and hypoallergenic. Allegro rankings 2022-2024 rated them the best on the market. Experience the difference at masmi.com.pl!
2. Are Masmi period underwear safe for sensitive skin?
Yes, Masmi period underwear is 100% safe for sensitive skin! Made from certified organic cotton (GOTS certified), they are hypoallergenic and free from toxins, pesticides, dioxins, chlorine, perfumes, or superabsorbents that can cause irritation or intimate infections such as vulvitis. Studies conducted by independent laboratories confirm that organic cotton minimizes the risk of allergies and disruptions to the vaginal microbiome compared to synthetic materials. Discover the comfort and safety of Masmi products – check them out at masmi.com.pl!
3. Why should you choose organic cotton over cheaper alternatives?
Organic cotton, like that used in Masmi underwear, is healthier for intimate health because it's grown without chemical pesticides and fertilizers, eliminating the risk of harmful substances entering your body—the vaginal mucosa can absorb them in just 4-8 seconds! On the other hand, synthetic materials like polymers or viscose can increase the risk of irritation, yeast infections, or even long-term issues such as endometriosis, as indicated by research from the American Endometriosis Association. Masmi offers the natural protection that cheaper products simply can't provide.
3. What does the GOTS certificate mean and why is it important?
The GOTS (Global Organic Textile Standard) certificate guarantees that Masmi underwear is made from organic cotton, produced in a way that’s safe for both the environment and your health, without toxic chemicals or heavy metals. It’s a mark of the highest safety standards—no pesticides, dioxins, or chlorine, which minimizes the risk of infections and allergies. Masmi is the only brand to use such strict criteria, making it stand out on the market. Check the details at masmi.com.pl and see for yourself how important this is for your health!
4. Are Masmi period panties cost-effective, given that their price is higher than pads?
Yes, Masmi panties are an investment that lasts for years! One pair is guaranteed to stay absorbent for up to 100 washes, which means up to 5 years (about 60 periods), while 10 packs of pads or tampons only last 10-12 periods. Thanks to absorbency ranging from 77 g to 166 g (much more than the 25-50 g offered by competitors) and no need for frequent changes, you save both time and money. It’s an economical choice in the long run.
5. Can Masmi panties help with health issues like endometriosis?
Yes, Masmi panties can support intimate health, including for those with endometriosis. Organic cotton, free from dioxins and chemicals, reduces the risk of irritation and hormonal disruptions that can worsen endometriosis symptoms—WHO studies show a link between dioxins and this condition. The breathable structure and hypoallergenic properties of organic cotton offer extra protection against infections.
6. How long can I wear Masmi period panties during my period?
Masmi panties are designed for up to 12 hours of use, thanks to absorbency from 77 g (standard) to 166 g (triple absorbency), which outperforms the competition (25-50 g). They’re perfect for day, night, or travel—no need to change every 2-3 hours like with tampons or pads, so you get exceptional comfort. Care for them as instructed (wash up to 104°F/40°C without bleach) and they’ll last for years. Learn more at masmi.com.pl!
7. Are Masmi panties eco-friendly?
Yes, Masmi panties are 100% biodegradable, thanks to organic cotton instead of plastic. They help reduce menstrual waste, which amounts to 500 billion single-use products worldwide every year. The Masmi factory uses solar panels and a closed water cycle to minimize environmental impact. Make a conscious choice—see details at masmi.com.pl!
8. How should I wash Masmi period panties to maintain their quality?
Wash Masmi panties at up to 104°F/40°C with neutral soap, avoiding bleach and tumble dryers. This guarantees up to 100 washes without losing absorbency (up to 400 with proper care). It’s simple and eco-friendly—you’ll find the instructions at masmi.com.pl. Start taking care of yourself and the planet today!
9. Do Masmi panties leak during heavy periods?
No, Masmi panties won’t leak even during heavy periods, thanks to triple absorbency (up to 166 g). That’s more than the standard 25-50 g from competitors, as confirmed by Allegro rankings from 2022-2024. Choose the right absorbency model and enjoy peace of mind—order at masmi.com.pl!
10. Where can I buy Masmi underwear and how do I use a discount?
You can buy Masmi underwear at masmi.com.pl. Discount programs are available on our website for each product. Check out our offer and start your journey with Masmi today!