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Leakproof Period Underwear
$38.00
Unit price
$38.00
per
item
Each
This is period underwear, reimagined.
High-performance protection that feels like your favourite underwear. Soft, breathable, and surprisingly low-profile, joni Leakproof Period Underwear is built for real bodies, real flow, and real life.
Wear it solo. Wear it as backup. Wash, repeat, keep moving.
Features:
- Premium merino wool lining for breathable comfort that manages odours naturally
- 360º leak protection for full front-to-back coverage
- Up to 8 hours of protection (individual results may vary) = 4 regular tampons (40 ml capacity)
- Long-lasting durability validated by wash-cycle testing for 100+ washes (double standard period underwear)
- Designed for sensitive skin
- Designed in Canada
True to size with a secure, full-coverage fit. If you’re used to lower-coverage, high-stretch underwear, you may prefer to size up for a little more room.
How do I wash joni period underwear?
Wash joni period underwear in cold water without bleach. Then, hang to dry. Do not put in the dryer or dry clean. If you're not ready to wash your period underwear right away, simply rinse or even hand wash in your sink.
Dependable coverage
Full coverage brief design with 360° full front-to-back leak barrier.
8 hours of leak protection
Up to 8 hours of leak protection = 4 regular tampons on average.
100% merino wool lining
For temperature and odour control, plus next-to-skin comfort.
built to last
Designed for 100+ washes—more than double the average lifespan.
Period underwear that does more.
Your body deserves better than “industry standard.”
joni period underwear is tested for harmful substances and designed for sensitive skin—and peace of mind built in.
Made from ultra-smooth and breathable lyocell, a regenerated cellulose fiber derived from renewable plant resources that are responsibly sourced. It's crafted using a sustainable closed-loop process that recycles water and reuses over 99% of the solvent—making it kind to the planet.
DESIGNED FOR COMFORT & PERFORMANCE
- BODY: Lyocell, cotton, spandex moves with you and retains shape
- LINING: Merino wool regulates temperature and odour
- LIQUID BARRIER: Viscose from bamboo + cotton laminated to Thermoplastic Polyurethane (TPU) film that's both breathable and waterproof
Real people, real reviews, happy customers.
These are my new favorite period underwear. I greatly appreciate the front to back coverage - I can attest to the coverage and protection provided I only wish my teenage-self had these!
— LISA
I cannot get over the quality of this period underwear. I love how sturdy it feels, even though it's also so soft! I feel secure and comfortable all day long. Being able to throw these straight into the washing machine makes them so easy to use.
— ALISON
I always get uncomfortable with period pain and tampons and cups exacerbated my pain. These are comfortable and absorbent. Thank you!
— WENDY
Period care that’s better by design.
Frequently asked questions
Merino wool is a premium natural fibre chosen for the layer that sits closest to your skin. It's naturally soft, breathable, temperature-regulating, and helps manage moisture and odour, making it an ideal material for period underwear. Combined with joni's thoughtfully engineered absorbent layers, it helps create a comfortable wearing experience throughout your cycle.
While individual results will vary based on your flow, joni period underwear can hold 40ml, which is about the equivalent of four regular tampons, or up to eight hours of use.
Lyocell is incredibly efficient at managing moisture and has been engineered to absorb and release liquid faster than cotton. It's amazingly soft, and, mixed with spandex, it ensures joni period underwear moves with you while keeping its shape. Traditional textiles can be incredibly resource-heavy, but lyocell is made using a highly sustainable closed-loop manufacturing process using sustainably managed wood pulp.
joni period underwear is flexible and stretchy and true to size. Refer to the size chart in the images above and measure your waist and the widest part of your hips to ensure an accurate fit.
Caring for your joni period underwear is easy! Simply wash in cold water and hang to dry. You can easily throw them in the washing machine or hand-wash. Do not bleach, put them in the dryer, or dry clean them. Your period underwear will keep their shape!
We want you to feel confident and comfortable in your joni period underwear. That’s why we offer a 30-day risk-free trial on your first pair.
If you need to return your underwear, please contact us within 30 days of delivery so we can help find the best solution.
joni period underwear is designed for a secure, supportive fit that moves with you and helps you feel comforted and protected. If you’re between sizes or unsure, we recommend sizing up. Be sure to check the size chart for detailed measurements.
The 30-day trial begins on the day your order is delivered.
- If you try your first pair and the size isn’t quite right, reach out to us at hello@getjoni.com to discuss!
- If your period underwear arrives with a fault, defect, or quality issue, we’ll issue a full refund to your original payment method.
Our goal is simple: to make sure you feel supported, comfortable, and confident—every step of the way.
2% for menstrual equity
1 in 3 Canadians under the age of 25 don't have access to safe period care across our communities. Our 2% giveback model funds period product donations, education and research initiatives with our non-profit partners.
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