The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows
The Bikini Period. in SportyStretch™ For Heavy Flows

The Bikini Period. in SportyStretch™ For Heavy Flows

4.5
Rated 4.5 out of 5 stars
623 Reviews
$10.50
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Buy 6+ Save 10%, Buy 9+ Save 15%

1 pair absorbs 9 tampons of flow

Leak-free, super-absorbent, designed to withstand ultra-movement and sweat.  Absorbs up to 9 tampons worth of flow!

Your favorite bikini can now do a marathon, a spin class, a barre class, you name it! Or I’m just great for a busy day of running around.  I’m currently the world champion in being waste-free and super-absorbent.

The Sporty. Bikini is made from our PeriodTech® fabric - a super stretchy Nylon and Spandex knit that moves with you. As always, the gusset is made with organic cotton.

When To Wear: doing a marathon, going to the supermarket, and everything in between.

Trying to do period math? Click here to work out how many pairs you need for your period according to your Flow Threshold.

This style runs true to size. Order your most standard size. 

You can see our size chart here.

Our Fabrics

Main: PeriodTech™ 95% Nylon with 5% Spandex Knit

Lining: 95% Organic Cotton with 5% Spandex Jersey

Absorbent Layer: 88% Polyester with 12% Nylon 

Leak Resistant Layer: 100% Polyester PUL

 

How to take care of your Period.

Rinse any fresh blood off in the sink or the shower.

Hang to dry then add to your laundry pile. 

Machine wash warm, no bleach.

Tumble dry low. Do not dry clean or iron. 

Each pair of Period. underwear can hold up to 10 tbls, or 8-10 tampons, worth of blood.

Check out our absorbency test video here.

How long will one pair of Period. last?

Everybody periods differently so it’s tough to be exact. Our average time is about 8 hours on a heavier flow day. Though some customers need to change after 3 to 4 hours, and others can go up to 14 hours (lucky them!). As your period gets lighter, one pair can take you through the day and night (just like regular underwear). But again, everybody Periods differently, so you need to take one cycle to figure out exactly how often you need to change. Start with a conservative estimate on your heavy days, and check in on your Period underwear after 4 hours. If you still feel good, give it another hour. Keep going until you figure out your limit. Here at Period, we find we need between 3 to 4 pairs on the first two heavy days, including evenings. And if you leak, please forgive us! Just this once. (Remember how many tampons you have forgiven). Treat the ‘leak’ as a gift and note the hour of your leakage. That is the best indicator of your ‘flow threshold’ how long the underwear will last for you.

Message from a Cheetah: Hi! You know me. You know how much I love to run. Running is the best thing in the universe. The only that ruins it is when you run past a decomposing tampon or pad. Man, that sucks. There are some things you can't unsee and that's one of them. But not for much longer! With incredible people like you, we're going to end all this ridiculous waste and make my runs fantastic again. Kudos.

4.5
Rated 4.5 out of 5 stars
Based on 623 reviews
Total 5 star reviews: 435 Total 4 star reviews: 94 Total 3 star reviews: 66 Total 2 star reviews: 23 Total 1 star reviews: 5
85%would recommend this product
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How did your Period. fit compared to other underwear?Rated -0.0 on a scale of minus 2 to 2
How well did Period. absorb your flow? Rated 0.9 on a scale of minus 2 to 2
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623 reviews
  • K
    Kat
    Verified Buyer
    I recommend this product
    What size of underwear do you typically wear? M
    What size in Period. did you purchase? M
    What do you use your Period. products for? Primary Period Protection
    Rated 5 out of 5 stars
    1 year ago
    Sneeze or Cough as Much as You Need, No Leaks

    I got my period yesterday, second period after getting off of depo earlier this year. I’ve always had a heavy painful flow and it is back with a vengeance….omg do I wish I had these in high school. I got home from the gym at 10:00 am, showered, put these on and have had them on until now, which is 6:12pm. I have not even had the thought of putting in a tampon. The part that looks wet in the image is somehow DRY?? I pushed a wad of toilet paper against it and its definitely absorbed everything from the day—absorbed to where, a mystery to me. There was also no bleed through on the underside of the underwear (see grey part of photo. I’ve seen at least 2 decent clots and a ton of dark blood in the toilet every time I’ve used the restroom today. I also can’t smell a thing even putting my face within a foot of the bloodied underwear after wearing for almost 8 hours. Can’t say the same if this was a pad or a tampon. I just bought 2 overnights and I’m going to get 3 more pairs of these when they’re back in stock. These are insanely good. Curious how they hold up after a wash.

    How did your Period. fit compared to other underwear?Rated 0.0 on a scale of minus 2 to 2
    How well did Period. absorb your flow? Rated 2.0 on a scale of minus 2 to 2
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  • CA
    Christina A.
    Verified Buyer
    I recommend this product
    What size of underwear do you typically wear? L
    What size in Period. did you purchase? L
    What do you use your Period. products for? Period Backup, Overnight Protection , Light Bladder Leaks
    Rated 5 out of 5 stars
    1 year ago
    Great Product

    Why did it take so long to come up with this? I've bought other brands but Period brand panties are the best! Feel like your wearing regular panties without a diaper!!! I wear them in addition to my period pcup since i hate pads!! My mom even bought some!

    Will definitely be buying more! In a medium next time!

    How did your Period. fit compared to other underwear?Rated 1.0 on a scale of minus 2 to 2
    How well did Period. absorb your flow? Rated 0.0 on a scale of minus 2 to 2
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  • JW
    Jane W.
    Verified Buyer
    I recommend this product
    What size of underwear do you typically wear? S
    What size in Period. did you purchase? S
    What do you use your Period. products for? Primary Period Protection
    Rated 5 out of 5 stars
    23 seconds ago
    More Physically and Mentally Comfortable.

    As a 21 year old, who has had her period for over a decade, I still didn't like having to rip open a pad in a public bathroom. It felt like using a megaphone to make sure everyone else in the room knew it was that time of the month! I shouldn't feel embarrased by something my body does naturally, and the Period. underwear totally help me to feel more comfortable. No noisy pad wrappers, no sticky wings, and nothing to throw away. It's made for a better overall period experience.

    How did your Period. fit compared to other underwear?Rated 0.0 on a scale of minus 2 to 2
    How well did Period. absorb your flow? Rated 0.0 on a scale of minus 2 to 2
    Was this helpful?
  • Z
    Zoe
    I recommend this product
    Rated 5 out of 5 stars
    Yesterday
    5 Stars

    I have had these and 2 other pairs of period underwear for about a year now. they are so nice to have. I hate wearing pads and tampons are sometimes painful. This is a great alternative for those who have sensory issues. They last me for about one day maybe two if my flow isn't as heavy. On the first/second day of my period they last for almost the whole day but I sometimes have to change them earlier because of an extremely heavy flow. I recommend the grey color as its easier to tell if you have leaked or not as opposed to the black pairs. I also love how affordable they are.

    Was this helpful?
  • JD
    Jacqueline D.
    Verified Buyer
    I recommend this product
    What size of underwear do you typically wear? XL
    What size in Period. did you purchase? XL
    What do you use your Period. products for? Period Backup, Overnight Protection
    Rated 4 out of 5 stars
    1 week ago
    Great so far

    I am hesitant to give all 5 stars as I have only used them for one cycle. So far they have exceeded my expectations. Super comfortable and fit true to size. Would highly recommend, not sure why I didnt go this route earlier.

    How did your Period. fit compared to other underwear?Rated 0.0 on a scale of minus 2 to 2
    How well did Period. absorb your flow? Rated 2.0 on a scale of minus 2 to 2
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