do you have questions about ooia products?
On this page you will learn everything on how to find your correct size and how to use ooia products.
what is your ooia underwear size?
ooia products are true to size. You can simply order your usual size.
If you are unsure which size fits you, simply take your hip measurement and compare it with our size chart.
You measure the hip circumference best horizontally at the widest part of the buttom. The tape measure should be flexible, fit snugly, but not cut in.
If you are between two sizes, order the smaller size. Exception: if your thighs are very strong and you are between two sizes, we recommend ordering one size larger.

what is your ooia nursing bra size?
The best way to measure the chest circumference is horizontally at the strongest part of the chest. The tape measure should be flexible and fit snugly, but not cut in. Then measure the underbust circumference under the breast. The tape measure should be tight here. Your size results from the measurements of the chest circumference and the underbust circumference.
The ooia nursing bra is suitable for any bust up to cup size C. If you have cup size D and larger, we advise you to choose our nursing bra for big cups. If you are between two sizes, we recommend that you order the bra one size larger.

how to measure yourself
Underbust circumference:
- place the measurement horizontally under the base of your breasts
- breathe out and pull the tape measure tight
- keep an upright posture, facing forward
- read off the centimetres with your body in an upright position
Chest circumference:
- wear a bra without push-up, preferably an unpadded one
- place the measuring tape horizontally to the ground around the widest part of the chest without digging in
- keep an upright posture, facing forward
- read off the centimetres with the body in an upright position
what is your ooia feel dry top size?

The ooia Feel Dry Top is a normal size. You can simply order your usual clothing size in tops.
The Feel Dry Top is about hip-length so you can also put it in your pants.
Please keep in mind that the Feel Dry Top should fit tightly - so if you are between two sizes, better order the smaller size!
If you are unsure what size fits you, simply take your chest circumference as a guide and compare the measurement with our size chart. The best way to measure the chest circumference is horizontally at the strongest part of the chest.
buy your feel dry top now
how do you create your ooia period set?
Your period is unique. Therefore, your ideal set of ooias is also unique.
How many ooias you need depends on many factors: the strength of your bleeding, the duration of your period, whether you want to use ooia alone or in combination with other period products, and how often you want to wash them.
To cover your entire period, most women* will need five to six ooias.
The logic behind this is: one ooia for the day and one for the night - wash them after two days, and while the first four ooia pants dry, put on the two you haven't used yet. Then it's back to the first one.
Basically, one ooia has 1-6 tampons/10-30ml intake, depending on the model.
If you bleed more in a day, you can either use more than two per day, or wear ooia along with a tampon or menstrual cup.
Some will get along with fewer ooias if, for example, you live in a household that washes daily.
create your ooia sethow do i use ooia products?
It's really simple.
Put them on in the morning, wash in the washing machine at 40°C after wearing, air dry and put on again. Done.
The ooia period underwear should also be rinsed with cold water before washing. We recommend our ooia Washbag to protect the high-quality materials of your ooias when washing in the washing machine.
how do i know how much the ooias absorb?
We have included small drop symbols for you to indicate the absorbancy.
One drop means an absorbency of 1-2 tampons. The ideal product for your lighter period days.
Two drops means an absorbency of about 2 tampons. The ideal product for your lighter to medium period days.
Three drops mean an absorbency of about 2-3 tampons. The perfect product for your medium to heavier period days.
Five drops or more mean an absorbency of about 6 tampons. The product is therefore ideal for your heavier period days.
how do ooia products work anyway?
Feel free to check out our "Technology" page, we'll be happy to explain everything in detail.
buy your ooias nowhow does ooia period underwear deal with bacteria and odors?
The use of the bacteria-inhibiting agent prevents the formation of odors and the proliferation of germs. As the only period underwear in the world, ooias antibacterial effect and health safety has been confirmed by an external laboratory. Learn more.
still have questions?
Look at our FAQs, many questions are answered there. If you don't find what you're looking for there, feel free to contact us at info@ooia.de
Do you want to know what customers say about ooia?
Then take a look at our Experiences page or at the independent review platform Trustpilot, where thousands of positive reviews can already be read.