The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows
The Sleeper Period. in Organic Cotton For Heavy Flows

The Sleeper Period. in Organic Cotton For Heavy Flows

4.3
Rated 4.3 out of 5 stars
967 Reviews
$26.00
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1 pair absorbs 9 tampons of flow

Heavy absorbency: designed for heavy nights, mid flow nights and outrageous day 1s.  

Absorbs up to 9 tampons worth of flow!

I’m dedicated to giving you a good night’s sleep on your period. I have a built in five layer padding that absorbs vertical flow and horizontal flow, because when you sleep your period can flow a little differently and I want to make sure your night is leak proof.  I’m made of soft organic cotton and am cozy, comfy and snug so you feel safe and secure and like you’re wearing a combo of your favorite leggings and PJs. I’m also great for those outrageous first heavy days, when if you have an option of laying on a couch all day, you take it. Sleep well.

When to wear: on heavy nights, or very heavy days.

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 fits like a true bike short.

You can see our size chart here.

Our Fabrics

Body: 95% Organic Cotton with 5% Spandex Jersey

Absorbent Layer: 100% Polyester  

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 9 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 used tampon: Hi, I’m a tampon that was last used in 1946 - only once - and I’m still languishing on a land fill. As you can imagine, I’ve had a lot of time to reflect. What was the point of me? Why did someone use me once for just a few hours and nearly a hundred years later, I’m still here? Why? This feels like a pretty stupid system to me. Please overthrow it! Please use non-disposable products so that no tampon ever has to feel this useless again. Thank you. 

4.3
Rated 4.3 out of 5 stars
Based on 967 reviews
Total 5 star reviews: 597 Total 4 star reviews: 180 Total 3 star reviews: 123 Total 2 star reviews: 52 Total 1 star reviews: 15
80%would recommend this product
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How did your Period. fit compared to other underwear?Rated 0.2 on a scale of minus 2 to 2
How well did Period. absorb your flow? Rated 0.7 on a scale of minus 2 to 2
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967 reviews
  • I
    Icy_feet
    Verified Buyer
    I recommend this product
    What size of underwear do you typically wear? S
    What size in Period. did you purchase? XS
    What do you use your Period. products for? Period Backup, Primary Period Protection, Overnight Protection , Everyday wear
    Rated 5 out of 5 stars
    7 months ago
    Great as actual shorts! Ordered XS for S

    Wearing them literally as shorts, fits great, they looks like just nice bike shorts but they are for periods! Great quality and fast exchange if wrong size ordered,

    How did your Period. fit compared to other underwear?Rated 2.0 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?
  • L
    Linh
    Verified Buyer
    What size of underwear do you typically wear? M
    What size in Period. did you purchase? S
    What do you use your Period. products for? Overnight Protection
    Rated 3 out of 5 stars
    Yesterday
    Weird Fit - Long crotch

    Wish I could give this 5 stars but this just fit weird. Long crotch even though I sized down from the size chart. At 5' 1" I'm wondering if my height makes a difference. I was lured to make a purchase during black friday due to the single picture (as of this moment, 12/2025) of the girl wearing and holding the bag package, claiming they look just like biker shorts. Proceed with caution my short queens. Especially if you already have to size down anyway for other underwear from period co.

    How did your Period. fit compared to other underwear?Rated 2.0 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?
  • KW
    Katie W.
    Verified Buyer
    I recommend this product
    What size of underwear do you typically wear? 3X
    What size in Period. did you purchase? 3X
    What do you use your Period. products for? Primary Period Protection
    Rated 5 out of 5 stars
    2 days ago
    These have changed my life.

    I don’t usually review items that I purchase. So please know, this is how passionate I feel on the subject. I can’t tell you how many people I have recommended these underwear to. These have absolutely changed the way I feel about my period. I have always dreaded my period as I have always had a heavy flow. I was nervous about this purchase because I thought I would feel icky having blood on me all day. YOU DON’T EVEN NOTICE. These are so absorbent and so comfortable. I bought 5 pair. Four panty style and this one boxer style, a pair for each day. I have experienced no leaking personally. I usually wear a 2x-3x panty/boxer. They fit perfectly. They have literally changed my life. I will never go back to pads or tampons. If you are thinking about buying these, you definitely should.

    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
    Was this helpful?
  • S
    Shalie
    I recommend this product
    What size of underwear do you typically wear? M
    What size in Period. did you purchase? L
    What do you use your Period. products for? Post Partum
    Rated 5 out of 5 stars
    1 week ago
    Postpartum

    I wore these during postpartum for my first baby and loved them over diapers and pads. I'll be wearing them again during my second postpartum journey.

    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?
  • B
    brandi
    I do not recommend this product
    Rated 1 out of 5 stars
    1 week ago
    1 Star

    Way bigger than the other mediums I bought & fit really weirdly. Baggy and tight at the same time. If youre gonna get these maybe size down.

    Was this helpful?
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