Period-proof panties or menstrual panties are your usual pair of underwear that, thanks to an absorbent lining, are like 2 in one – lingerie and hygienic protection at the same time!

Yes! THATDAY has a special multi-layer system that soaks up menstrual blood in a hygienic way and traps it there so it can’t come back out unless you wash it. It works similar to how a single-use pad would, but with less bulkiness and more areas for absorbency. You can use them for heavy periods or to protect yourself from spotting.

Our lingerie is made to be worn up to time until it

feels comfortable to you. There is no risk of leaks

thanks to our absorbent lining of 3 layers doubled

with a waterproof fabric that retains liquids. If, however, your flow is heavy and you think you might have leaks, you can also use classic sanitary protections in addition, but it’s not mandatory. The

ideal is to see for yourself and test our menstrual lingerie in the comfort of your own home, pj’s (and the cake, of course) of one day of your heavy flow.

A great way to give period underwear a try is to wear it overnight towards the end of your period when your flow is lighter. This way you can start experimenting and feeling the benefits even at the end of your cycle! Then additionally, trying it out as a backup on a heavier day is great too!

Yes, such underwear is even approved by gynecologists. As long as you follow THATDAY care instructions and your hygiene, menstrual panties

are a safe solution.

Unlike tampons there is no risk of TSS from period panties since they are worn externally.

Yes, you can swim. However, we do not recommend doing this during the heavy flow. Instead, we recommend THATDAY underwear for enjoying land activities or sunbathing.

Mostly like a regular pair of panties, it’s thicker than your average pair of underwear, but is not obvious under tight pants.They feel a little bit like bathing suit bottoms, but the inside is soft like normal underwear. After wearing THATDAY panties for the first time after around 8 hours, mostly there are no leaks, but they will not be dry anymore, they will not soak, but at a heavier flow you may feel moisture being held against your body.

With one pair it will be enough to understand how they work and do you like this solution. However, to feel comfortable and relaxed through out the day and night you will most probably need 2-3 pairs or more depending on the length of your period.

The answer is – YES, of course you can! But for your security and calmness we recommend experimenting them at home at your first period day and night to find out how it works for you. How often you should replace them, and how comfortable you are with THATDAY reusable panties.

All our fabrics are OEKO-TEX® certified (designed for direct skin contact) they are skin friendly and will suit any type of skin and condition with it’s special mission to take care of you.

Please refer to our size chart when purchasing THATDAY. THATDAY panties tend to run smaller than standard underwear sizes due to the multiple layers. If you are on the size limit – we recommend taking a size larger to ensure comfort throughout the day.

Please refer to our size chart when purchasing THATDAY. THATDAY panties tend to run smaller than standard underwear sizes due to the multiple layers. If you are on the size limit – we recommend taking a size larger to ensure comfort throughout the day.

Yes, and we even recommend it! However, please note that the panties can be exchanged for another size or model, if they have not been used and all the hygiene stickers have been preserved on them. The 40-day trial period does not apply if the size proves to be too small after use.