How does it work?
Oya period underwear uses a multi-layer protection system designed to keep you feeling dry, comfortable and confident throughout the day:
- Moisture-wicking top layer instantly pulls liquid down and away from your skin, keeping you feeling fresh and dry.
- Absorbent core holds up to 30ml of fluid without feeling bulky or heavy.
- Waterproof layer for complete leak-free confidence.
- Soft, breathable outer fabric provides all-day comfort with a smooth, stretchy fit.
Simply wear Oya like your regular underwear and let the built-in protection do the work.
How much fluid can it hold?
Both our Brief and High Waist styles can absorb up to 30ml of liquid, equivalent to around 4 regular pads (based on an average absorbency of 7ml per pad).
Can it leak?
Oya period underwear is designed to provide reliable leak protection when worn within its absorbency capacity. However, like pads, it can leak if it becomes fully saturated.
Our layered technology draws fluid away from the surface and locks it into the absorbent core to minimise leaks. For the best protection, match how long you wear each pair to your flow level.
Do period pants feel wet when you're wearing them?
No, Oya underwear is designed to feel dry against your skin. The moisture-wicking top layer quickly pulls fluid away from the surface and into the absorbent layers below, keeping you comfortable throughout the day.
Can the period underwear absorb clots?
Period underwear will quickly absorb the blood around a clot, but it can't absorb the clot itself, similar to how a pad works. We recommend wiping the clot away when you next use the bathroom, then continuing to wear your underwear as normal.
How long can I wear the underwear?
This depends on your individual flow and activity level. Most people can comfortably wear Oya period underwear for up to 12 hours. If you have a heavier flow, you may need to change more frequently.
For your first use, we recommend trying oya at home to understand your flow level.
Can I wear it between periods?
Yes! Oya can be worn any time of the month, for light bladder leaks, discharge, spotting, sweat, or everyday peace of mind.
What is modal?
Modal is a fabric made from sustainably sourced beech wood fibres. It's known for being exceptionally soft, breathable, lightweight and moisture-wicking, which is why we use Tencel™ Modal in Oya's fabric blend, for a fit that feels gentle against the skin all day long.
How do I find my size?
We recommend using our Size Guide and measuring your hips at the widest point for the most accurate fit. If you're between sizes or unsure of your size, we recommend sizing down for a secure fit
Are they free from PFAS and other harsh chemicals?
Yes. Oya period underwear is made without added PFAS ("forever chemicals"). We prioritise materials that are safe, comfortable, and suitable for everyday wear. If you'd like more information about our materials and testing standards, please contact our team.
How do I wash my period underwear?
- Rinse in cold water after use until the water runs clear.
- Machine wash cold on a gentle cycle.
- Do not use fabric softener or bleach, as these can affect absorbency.
- Air-dry completely before wearing again.
With proper care, Oya underwear is designed to be worn again and again.
How many pairs do I need for my cycle?
This depends on your flow and laundry routine. As a general guide:
- 3-4 pairs if you're happy washing regularly throughout your cycle.
- 5-7 pairs, our most popular option, for comfortable rotation.
- 7+ pairs if you prefer washing less often or want full-cycle coverage without laundry.
I've never tried period underwear before, where do I start?
If you're new to period underwear, we recommend wearing Oya on a lighter flow day, or at home first, to get familiar with how it feels. Many customers start by replacing daytime pads, then gradually wear period underwear throughout their cycle as they learn their flow patterns. Within a cycle or two, you'll have a good sense of how long each pair lasts for you.
Received the wrong item?
Please contact us via email or LINE and include:
- Your order number
- The item you ordered
- The item you received
- Clear photos of the item(s) received
Our team will review your request and help resolve the issue as quickly as possible.
What if I've ordered the wrong size?
We know finding the perfect fit can sometimes take a try.
To check the fit, we recommend trying your Oya underwear on over your own underwear before removing the hygiene seal.
If you need a different size, we're happy to exchange it, provided that:
- The hygiene seal is still fully intact.
- The original product tags are still attached.
- The underwear is unworn, unwashed, and in its original condition.
For hygiene reasons, we can't offer refunds or exchanges once the hygiene seal has been removed or the tags have been detached.
How can I contact customer support?
Our team is happy to help with sizing, orders, or general questions. Reach out to us at ..EMAIL @@@and we'll get back to you within 1-2 business days.
How long does shipping take?
Orders are processed within 1-2 business days. Standard delivery within Thailand typically takes 2-4 business days, while international orders can take 7-14 business days depending on the destination.
Do you ship internationally?
Yes, we ship to most countries. Shipping costs and delivery times are calculated at checkout based on your destination.
How can I track my order?
Once your order ships, you'll receive a confirmation email with a tracking number and link so you can follow its progress.