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Adjustable Absorbency

BOOST Brief

BOOST Brief

$50.00
$50.00
Sale Sold out
Buy 5 Get 2 Free With Code: 2FREEFORME
Size
Color: Black
Use your HSA or FSA when you checkout with Flex

Includes one removable Booster that let's you increase the absorbency on heavy flow days, or dial it back for light flow days. Holds 4 regular tampons without Booster and 8 regular tampons with a Booster.

Details

● Best for heavy flow and long hours thanks to our easy swap Booster
● Made with a buttery soft blend of TENCEL™ and organic cotton for an ultra comfortable feel
● Holds up to 8 regular tampons with Booster
● Machine washable and dryer safe
● B Corp Certified sustainable and ethically made
● Leakproof, breathable, and PFAS-free (no detectable levels up to 1PPM)
● Sales Tax Free in Canada
● FSA/HSA accepted at checkout in US

How Do Period Underwear Work?

Period/leakproof underwear works by using a combination of absorbent and waterproof layers to trap and lock in menstrual flow. The top layer wicks away moisture and keeps you dry, while the inner layers absorb liquid and the leakproof layer prevents leaks. Designed for comfort and performance, Aisle period underwear can be worn alone or as backup for other period products.

Materials

Body: 48% TENCEL™ lyocell, 48% organic cotton, 4% spandex
Gusset: 90% Truetex™ (88% recycled polyester, 12% organic cotton), 10% TPU
Lining: 86% recycled polyester, 14% organic cotton
Booster: ​65% recycled polyester, 24% polyester, 11% hemp
All materials are OEKTO-TEX certified and lab tested for PFAS. No detectable levels of PFAS to 1 part per million.

  • Made with TENCEL & organic cotton
  • Machine wash & dry safe
  • Replaces 100+ disposable products
View full details

BOOSTED

Each pair of Aisle Boost underwear can hold up to 4 tampons’ worth of flow on its own, plus 4 more with the removable booster. For heavy flow, just tuck in the Booster and swap it out as needed. No more mid-day undie changes!

200K+ People Use Aisle

Write a Review
average rating 4.6 out of 5
Based on 416 reviews
  • 5 Stars
    305 Reviews
  • 4 Stars
    61 Reviews
  • 3 Stars
    39 Reviews
  • 2 Stars
    7 Reviews
  • 1 Star
    4 Reviews
92% of reviewers would recommend this product to a friend
Absorbency
Rated 4 out of 5
Comfort
Rated 4 out of 5
Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
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416 Reviews
Reviewed by Shelli
Verified Buyer
BOOST Brief
Reviewing
BOOST Brief
I recommend this product
Flow
Moderate
Height
5'4
Hip
59" - 62"
Size
3X
Rated 5 out of 5
Review posted

The Best Period Underwear I Have Tried

I will definitely give it that Aisle is the best period underwear that I and my daughter have tried. We have tried a lot, at least seven or more brands. These are soft, stretchy and the best part is they can be washed and dried like normal. That is a huge plus. They are true to size. I am between a 3x and 4x....same in these.

My favorite is the boost brief. I found the overnight boxer do not fit my body well and that did cause an issue for me. I want an overnight panty but they only have the boxer. I really want a booster brief with higher protection in the back and even front for back and front sleepers. They are great for daytime but not nighttime. Most period panties I tried had the protection go much higher in the front and back, so that is a disappointment. The other thing I hope they change is the width of the gusset. Specifically for the plus side. The gusset is not wide enough for larger women. I have had it move over too much and not have enough coverage, causing a leak in a restaurant where I am still mortified and not sure I can ever go back. Along with it moving again in my car and now I have a big stain.

Ad long as I am careful that it doesn't move, then they are fine. But now with this two mishaps, it is making me more nervous to go with just the period panty without a pad as a backup and that feels like it defeats the purpose for me. I would expect others to have the same issue. So I am hoping they change the width of the gusset.

Change those two things and I…

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Absorbency
Rated 4 out of 5
Comfort
Rated 5 out of 5
Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
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Reviewed by Stephanis P.
Verified Buyer
BOOST Brief
Reviewing
BOOST Brief
I recommend this product
Height
5'8
Size
XL
Rated 5 out of 5
Review posted

Comfy! Great coverage

Super comfy and they feel super secure throughout the day.

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Absorbency
Rated 5 out of 5
Comfort
Rated 5 out of 5
Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
Was this helpful?
Reviewed by Tiffani H.
Verified Buyer
BOOST Brief
Reviewing
BOOST Brief
I recommend this product
Flow
Moderate
Height
5'4
Size
L
Rated 5 out of 5
Review posted

Game Changer

I have used some other popular brands and I've had an issue with leaks. As everyone knows, it's really obnoxious to go to the bathroom and change underwear especially on heavy days. These boosters.... genius. It's so easy to change them and to still have the security of knowing that the brief without the booster will work as a regular period panty. I love these so much and I don't have to purchase so many underwear.

Loading...
Absorbency
Rated 4 out of 5
Comfort
Rated 5 out of 5
Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
Was this helpful?

FAQ

How does the Booster work?

Boosters allow you to customize the absorbency of Boost period underwear to meet your needs. They also allow you to refresh your period protection throughout the day, without changing your underwear.

On light flow days, wear Boost undies without the Booster for 4 tampons worth of protection.

On heavy flow days, tuck a Booster into the slits at each end of the gusset, and swap them out throughout the day for 8 tampons worth of protection.

Do Aisle period underwear contain PFAS?

We do not add PFAS to any of our products. In addition to using OEKO-TEX certified materials, which are tested for the presence of PFAS, we also conduct additional third-party tests. No detectable levels of PFAS have been found in our underwear, based on a detectable limit of one part per million.

Do I need to wear a pad or tampon with Boost period underwear?

Nope! Boost undies were built to completely replace pads and tampons. Just swap out the Booster as needed throughout the day. Worn without the Booster, they can also be worn as backup protection with a tampon or menstrual cup.

I have heavy flow. Are these the most absorbent period underwear?

Boost undies are adjustable-flow period underwear that can accomodate light to heavy flow, providing up to 8 tampons worth of absorbency. For heavy flow, add the removable Booster and swap it out as needed during the day.

Looking for an all-in-one heavy period undie? Try our Super period underwear.

How do I wash period underwear?

Our period underwear were made to fit into your regular laundry routine. Just rinse the gusset in cool water before washing in the machine with your regular laundry. Avoid the use of fabric softener and bleach, as they can inhibit absorbency and cause the leakproof material to break down. Our undies are dryer safe, but we recommend hanging to dry where possible - it saves energy and prolongs the life of your undies!