Jacquard Period Briefs, 4 Pack, Black Blue Lotus Nude 4.2 · 8,112 ratings
$28.69
YOYI FASHION period underwear: the backup pair
We make the pair that sits between your pad and your favourite jeans. A leak-resistant lining from front to back, soft fabric on the outside, and enough pairs in a pack to get through the week.
Packs of two to six pairs · Sizes XXS to 5XL
Wash, air dry, wear again
Four drawers, one idea
The patterned one. The plain one. The teen one. The one that swims. Every pair we make is a backup pair.
Jacquard Period Briefs, 4 Pack, Black Blue Lotus Nude
Bamboo Viscose Period Briefs, 5 Pack, Black 4.2 · 8,933 ratings
$30.39
Teen Period Underwear, 5 Pack, Mixed Colors 4.1 · 35 ratings
$26.99
Period Swim Bikini Bottoms, Polka Dot 4.7 · 7 ratings
$19.99
How the backup pair works
Wear it with what you already use
Our period underwear is extra protection. Put in your pad, tampon or cup as usual, then pull the pair on over it.
The lining does the catching
A water-resistant lining runs from the front to the back of the brief, so an overflow meets fabric before it meets your clothes or your sheets.
Rinse, wash, air dry
Machine wash or hand wash, then hang the pair to dry. Keep it out of the tumble dryer — heat is hard on the lining.
For your style
A backup does not have to look like one. Our jacquard briefs come in lotus, violet, nude, blue and black, and most packs mix the colours so there is one for each day.
What wearers say
Best period underwear!
These are super comfortable! True to size, nice and stretchy, comfortable material. Good price for 5 pairs! Gives good coverage while also being thin so they don’t feel like a thick diaper or wad of fabric. I use it more for lighter bleeding/spotting I don’t think it could handle heavy flow days, but great for light bleeding/ leaks.
Polyester feel and comfortable.
I’m so glad I discovered these panties. No more accidental stains. They feel like real panties not depends and not loose in thigh area. Very comfortable. No plastic noise or feel. Just don’t put in dryer, they will shrink. Ordering more.
Perfect for heavy days
Got these for my 12 year old daughter who is 5'4" and weighs 134 pounds. Got these in an XL and these fit her well. They are comfortable and perfect for heavy days. They are padded enough to not be noticeable and prevent a leak. They are stylish along with functional. Highly recommend!
Total coverage and they are comfortable.
I am all for reusable items like these. They cut down on waste. These are nice and soft, and the absorbent part goes from the entire front to the entire back for great security!
My fav & a perfect panty
These bikini panties are my favorite. I have bought many, many pairs over the years. They fit great, always of good quality and I have never had any come apart. They are comfortable, breathable and cover the goods. As long as they keep making them, I will keep buying them 😁
Comfortable and Stylish!
These YOYI FASHION cotton thongs are both comfortable and stylish. The material is soft and breathable, making them great for everyday wear. The multi-pack offers excellent value, and the fit is perfect. They hold up well after washing, maintaining their shape and comfort. If you’re looking for a reliable and comfortable thong option, this is a great choice!
The pair that goes in the water
Our period swim bottoms and one piece are cut from quick-drying nylon and spandex with a lined gusset. Pool day, beach day, swim practice — pack the suit and go.
Period swimwear
A first pack for a first period
Our teen period underwear is sized for ages 8 to 16, with a front lining that sits a little higher and a back that reaches a little further. Five or six pairs to a pack.
Teen period underwearPair notes
How to wash period underwear so the lining lastsHow we wash YOYI FASHION period underwear: cold rinse, gentle wash, air dry, and why the tumble dryer is the one thing to avoid.Period underwear size guide: getting the fit rightA plain guide to choosing a size in YOYI FASHION period underwear, teen briefs, swim bottoms and cotton packs.What to wear with period underwearYOYI FASHION period underwear is extra protection. Here is how to pair it with a pad, a tampon or a cup, at night, at school and in the pool.YOYI FASHION size chart: period briefs, teen, swim and cottonThe YOYI FASHION size chart in one place: hip measurements for jacquard, bamboo viscose and mesh period briefs, teen age bands, swim bottoms and cotton thong sizes.Absorbency and layers, line by lineWhat each YOYI FASHION listing actually states about lining, layers and coverage — jacquard, bamboo viscose, mesh, teen and period swimwear, side by side.
Choosing YOYI FASHION period underwear: a short, practical guide
We get the same handful of questions before almost every order. Here they are, answered with what our listings actually state.
What is period underwear, the way we make it?
YOYI FASHION period underwear is a regular brief with a water-resistant lining sewn in behind the gusset, running from the front panel to the back. It is extra protection: you keep using your pad, tampon or cup, and the brief is the layer that is there if something gets past. That is why we call every pair a backup pair.
Because it is a backup, it earns its place on the days and nights when leaks usually happen — overnight, on long shifts, at school, on a flight. Many wearers also keep a pair for the lighter days at the start and end of a cycle.
Which line should I pick?
Jacquard period briefs are the patterned ones: a nylon and spandex knit with a floral design woven in, three layers of fabric in the gusset, and a size chart that reaches 5X-Large. Bamboo viscose period briefs are plain, thin and stretchy, the choice under leggings and fitted trousers. Mesh period briefs use a knit with tiny mesh holes for airflow, for warm weather and for people who run hot.
Teen period underwear is cut for ages 8 to 16, with a front lining that sits higher and a back that reaches further. Period swimwear — swim bikini bottoms and a one piece — is made of quick-drying nylon and spandex and is the only thing we recommend in the water.
How many pairs do I need?
Our leakproof period panties come in packs of two to six. A lined brief needs a full day to air dry, so think in rotations: two pairs to try a cut, three for a short cycle, five if you want a clean pair every weekday without doing laundry in between. Colour sets are mixed on purpose, so you can tell at a glance which pair is clean.
How do I get the size right?
Measure the fullest part of your hips and read across our size chart; jacquard and mesh briefs are charted from X-Small (32 to 33.5 inch hip) to 5X-Large (48 to 49.5 inch hip). A backup pair works when the lining sits close to the body, so if you are between two sizes the smaller one is usually right.
How do I look after them?
Rinse in cold water, machine wash or hand wash, and hang to dry. Keep period briefs out of the tumble dryer: heat damages the lining and can shrink the brief. Skip bleach and fabric softener. Swim pieces are washed cold and laid flat.
Before you order: a 30-second checklist
- Hip measurement taken and checked against the size chart
- Line chosen: jacquard, bamboo viscose, mesh, teen or swim
- Pack size matched to how often you do laundry
- A place to air dry — no tumble dryer
- Your usual pad, tampon or cup still on the shopping list
Our period lines side by side
| Line | Fabric | Lining and layers | Sizes |
|---|---|---|---|
| Jacquard briefs | 84% nylon, 16% spandex, woven floral | Three layers in the gusset, viscose and cotton lining | X-Small to 5X-Large |
| Bamboo viscose briefs | 95% bamboo viscose, 5% spandex, plain | Water-resistant lining behind the gusset | XS to 6XL on the chart |
| Mesh briefs | 84% nylon, 16% spandex, mesh-hole knit | Inner leak-proof lining, front to back | X-Small to 5X-Large |
| Teen briefs | Viscose and spandex, logo waistband | Raised front lining, extended back | XS to XL, ages 8 to 16 |
| Swim bottoms | 85% nylon, 15% spandex, quick-drying | Four-layer gusset | XS to 4XL on the chart |
| One piece | 85% nylon, 15% spandex | Lined gusset | S, XL and 2XL |
Every pack on this site is sold through our product listing at our partner store, which also handles the order, delivery and returns. Size chart · Layers by line
Pick your backup
All of our packs live on one product listing. Choose a size, choose a colour set, and the partner store takes it from there.