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SISUNDERWEAR Period pants Low Waist

SISUNDERWEAR Period pants Low Waist are an ecological alternative to classic disposable protections like sanitary pads and tampons. Innovative technology allows the panties to absorb equivalent to 2 to 3 tampons amount of liquid and provide effective protection for 12 hours without feeling damp or unpleasant odor. Thanks to the materials used, the panties are invisible under clothes, give an unbelievable sense of comfort and are a reliable protection against leakage. It is the perfect ally for the entire period, regardless of its intensity!


Absorbent OEKO-TEX certified cotton absorbs blood while remaining dry. It is gentle on the skin, completely safe and 100% natural.


Absorbing Eucalyptus absorbs your blood and prevents infection thanks to its bactericidal properties. Its capacity can be compared to 3 tampons!


The waterproof PUL material prevents leaks so you don’t have to worry about it while wearing the Sis menstrual panties.


Flexible Lycra gives it all style and shape. It is stretchy and adapts well to the shape of your body, without restricting your movements. It is also stain resistant, so you can clean it quickly and easily.

  • Before using for the first time, soak your new Sis in cold water for 20 minutes, then wash it to absorb the cotton.
  • After using the panties, rinse all blood with cold water before throwing it into the washing machine
  • Wash your panties at a maximum of 30 degrees in the hand wash mode, do not exceed 700 rpm in the washing machine
  • Never use the drying option in a washing machine
  • Never dry your panties on a hot radiator
  • Dry the panties in their natural position so that they are not bent
  • Sis panties can be dried in the sun
  • Due to the many layers, Sis panties can dry longer than normal underwear

You can use the Sis menstrual panties for up to 5 years with proper washing and storage rules. Check out our blog – How to care for menstrual panties?

– outer layer – lycra nylon 80% / elastan 20%

– waterproof layer PUL – polyester 100%

– absorbing layer – eucalyptus 80% / polyester 20%

– inner layer – cotton 100% (Materials in contact with your body are certified OEKO-TEX guaranteeing their non-toxicity and safety)

SISUNDERWEAR Basic Sis Low waist Rozmiar SoBio beauty Boutique SoBio Beauty Boutique



A: 76 cm-84 cm B: 24 cm


A: 80 cm-90 cm B: 25 cm


A: 84 cm-94 cm B: 26 cm


A: 88 cm-100 cm B: 27 cm


A: 92 cm-108 cm B: 28 cm

Period pants Basic Sis – FAQ

The sanitary pad is made of several layers. Usually there is a net of polyethylene or polypropylene (which causes chafing and is airtight, which is dangerous for the skin), inside an absorbent layer (often made of GMO cotton containing harmful pesticides), and at the end an anti-leak layer. It also has strips of chemical glue that can cause rashes and allergies. The structure of the sanitary napkin consists of layers, and so was the creation of the Sis period pants. A significant difference in the structure of sanitary napkins and menstrual panties is the absorbing layer – the sanitary napkin absorbs blood and retains it “forever.” Eucalyptus used in menstrual panties absorbs blood, but under the influence of water it releases it and after rinsing and drying it returns to its previous state Moreover, the absorbent layer of Sis Underwear in terms of po the outer one is much larger than even the largest night pads, which gives menstrual panties the ability to operate for up to 12 hours (the record in the testing phase is 18.5 hours 😉).

Let’s face it – menstrual pants consist of four layers, so their thickness is certainly noticeable. However, after putting it on, the pants will adapt to the shape of your body thanks to the Lycra. You may feel thicker material on the back, but it doesn’t cause any discomfort. When you bleed, you may feel wet for a while, however all blood will be quickly absorbed by the eucalyptus and the cotton will stay dry. At the end of the day, there is a possibility that the panties will get “a little heavier”, but our observations, tests and previous reviews of the Sis menstrual panties show that this does not cause any discomfort, nor is it particularly noticeable.

And isn’t it disgusting to have a tampon soaked in blood that naturally should flow out? Isn’t it disgusting that you stick artificial sanitary napkins to your own underwear with glue that is dangerous for the skin? The blood in the Sis menstrual panties is not even noticeable thanks to the black cotton we used on the inside. All the blood will be absorbed by the eucalyptus, which has natural bactericidal properties, thus preventing infections and the multiplication of bacteria. Plus, hey, your period is part of you and it’s time to break that taboo that it could be gross in any way!

No, the materials have been specially selected so that they are suitable for all skin types and do not cause allergies or irritation. The only possible contraindication may be too heavy a period, Sis menstrual panties are designed to protect you for 12 hours in case of a medium-heavy period.

Of course! Sis menstrual panties (as the name suggests) were designed mainly as a hygienic measure for use during the period, but they are also perfect for urinary incontinence, various types of heavy vaginal discharge, especially for postpartum women who are in the puerperium phase. Our absorbing part has been designed to perfectly absorb liquid regardless of its type and density.


XS, S, M, L, XL


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