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Forget Pads and Tampons — Knix Is Revolutionizing Period Protection With Its Viral, Leakproof Underwear

Staying stain-free even on your heaviest flow days has never been easier (or more stylish).

By Stacia Datskovska Plus Icon

Stacia Datskovska

Senior Commerce Writer for WWD

Recent Articles by Stacia Datskovska

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April 7, 2026, 12:18pm

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three models posing in knix bras and panties of different colors; best leakproof underwear

Courtesy Knix

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The average person who menstruates will use up to 17,000 tampons or pads in their lifetime, according to Healthline. That’s a lot of single-use products — not to mention daily annoyances revolving around the period essentials’ bulkiness, discomfort, and, on your heaviest flow days, an occasional inability to perform the duties in their job description. But what if you could ditch pads and tampons altogether, swapping them out for the best period underwear that will have your back from gym sessions and afternoon naps to busy work days and long flights? As an apparel category, leakproof underwear has become increasingly popular; leading the pack with its leakproof solutions is Knix, founded in 2013 by Joanna Griffiths out of Toronto.

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Buy knix’s most popular period underwear

As the #1 leakproof brand in North America, Knix equips all of its undergarments with unparalleled technology (think extra-long gussets for all-around security and peace of mind; absorbency levels that range from one to 11 super tampons; leak-averse bonded seams; odor neutralization; and the patented Fresh Fix innovation, featuring a built-in absorbent liner and protective barrier layer). All these bells and whistles become even more impressive when you realize that Knix’s undies…. actually look chic. You can shop by style, from bikini to thong to boyshort, and have the option of going with no-show selections, which won’t leave lines under your leggings during hot yoga. Buttery-soft fabric is the name of the game here, and Knix’s period underwear resists any associations with granny panties by coming in an array of coveted prints (we’re partial to the spring-evoking, limited-edition Meadows and runway-approved White Polka Dot).

After a full day or night of wear, you can simply pop the babies in the wash to rejuvenate them. Another bonus: You can pick your Knix underwear based on preferred absorbency, which spans from Essential (no absorbency) to Ultra (seven to 11 tampons’ worth, as mentioned before). Knix’s handy online quiz will help you identify the protection tier that’s right for your needs, whether you’re indeed looking to end your relationship with pads and tampons or want to deal with light bladder leaks-slash-discharge in a more stylish, wearable way. So too is Knix the ultimate choose your own adventure when it comes to sizing: graciously offering all of its fan favorites in XS through XXXXL.

Buy knix’s most popular period underwear

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Once you’ve locked in your ideal fit and style, you’ll notice an immediate boost in confidence, complemented by clean sheets and the end of leakage-related anxiety. Ready to completely overhaul your period routine? For a limited time only, WWD readers get 15 percent off their Knix purchases with the code AFLWWD15 at checkout, applicable sitewide. Because comfort with every move — cramps notwithstanding — should feel accessible. (You deserve nothing less, especially on weeks when Aunt Flo pays a visit.)

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Knix Leakproof UltraThin No-Show Bikini

$27

Buy Now at knix

Swathed in the fresh Meadows design, this fully invisible pair of undies boasts a bikini profile, a wide and comfy waistband, a mid-rise fit, and an absorbency capacity of 2.5 super tampons for your moderate flow days. Planning on breaking a sweat? Trust that its carbon cotton gusset top layer will keep you dry, comfortable, and worry-free.

Price upon publish date of this article: $27

Knix Super Leakproof Dream Boxer

$48

Buy Now at knix

Think boxer underwear for women is too baggy to do much of anything in the leak-elimination department? Think again. This model is backed by an internal brief that snugly hugs your bod, and it’s great for using at night alongside your heating pad and coziest weighted blanket. If you’re prone to tossing and turning in the wee hours, rest assured (literally) that the Dream Boxer will stay put, remaining breathable all the while.

Price upon publish date of this article: $48

Knix Super Leakproof Dream Short

$48

Buy Now at knix

“I was doubtful at first, but I was so wrong!! They are so comfortable, and I feel like they offer loads of protection. I have purchased four more pairs since,” a Knix loyalist says in her review of the Super Leakproof Dream Short. You’ll soon see what all the hype is about for yourself, what with its no-chafe support, supreme coverage, patented 360 LeakSeal tech, and 5.5-super-tampon capacity. Four whole layers come together here to soak up, lock in, and refresh. What more could a gal wish for?

Price upon publish date of this article: $48

Knix Super Leakproof Cotton Bikini

$29

Buy Now at knix

Knix launched its cotton-blend underwear line only last month, but it’s already turning out to be a hit — quite understandably. Exemplifying peak breathability, the cotton-and-spandex blend fuses softness with stretch and has even more liquid retentiveness than its Super Leakproof counterpart of the non-cotton variety. The bikini’s highlight? A sewn-in, floating liner that’s consistently reliable (yes, even overnight).

Price upon publish date of this article: $29

Knix SuperPlus Leakproof No-Show High Rise

$39

Buy Now at knix

This particular silhouette flaunts Knix’s longest, most absorbent liner ever, with happy customers sharing sentiments like the following: “I bought it thinking I’d use it as backup. I ended up wearing it alone. I haven’t used a tampon in years.” Not only does it look seamless and feel “barely there,” but the No-Show High Rise also specializes in priceless tummy-smoothing, making it a godsend for the postpartum months and period bloating both.

Price upon publish date of this article: $39

Knix Light Leakproof No-Show French Cut

$25

Buy Now at knix

Only managing spotting as of late? Knix’s “Light” level might be all you need. “Absorbing about one regular tampon or pantyliner worth of liquid,” per the brand, the vintage-coded, leg-elongating Light Leakproof No-Show French Cut style is sold in many neutral colorways. Reviewers frequently call out its satiny sensation and utter lack of lines (you’ll start believing you’re going commando).

Price upon publish date of this article: $25

Knix Light Leakproof No-Show Thong 3-Pack

$60 $75 20% off

Buy Now at knix

Everything is better in multiples, so don’t think twice about treating yourself to a Knix three-pack: in this case featuring its Light Leakproof No-Show Thong in various blue-powered shades. Though the thong doles out minimal bum coverage, it will have you covered during major weather events (read: the crimson tide).

Price upon publish date of this article: $60

Knix SuperPlus Leakproof No-Show Boybrief

$39

Buy Now at knix

More revealing than a boxer and more modest than a bikini, the boybrief strikes a sartorial balance in the world of panties. This one operates with a comfort-first ethos — taking advantage of front-to-back coverage while waving goodbye to bulk.

Price upon publish date of this article: $39

Knix Super Leakproof Dream Boxer 2-Pack

$80 $96 17% off

Buy Now at knix

What to wear when one set of period boxers is in the wash and you need protection urgently? Consider this the answer. You can choose the hue of each of the set’s two boxers, which arrive at your door with a complimentary wash bag for simplifying laundry day. (You’re already overwhelmed as is, and Knix gets it.)

Price upon publish date of this article: $80

Knix The Full Cycle Kit High Rise

$140 $177 21% off

Buy Now at knix

To sample the entire portfolio of Knix’s latest and greatest, turn to The Full Cycle Kit. Included: one Light Leakproof No-Show High Rise pair, two Leakproof UltraThin No-Show High Rise pairs, one Super Leakproof No-Show High Rise pair, and one Super Leakproof Dream Short pair. The point is to don a different panty on each new day of your period, depending on how much is coming out of you. Genius.

Price upon publish date of this article: $140

Knix Leakproof PJ Set

$93 $103 10% off

Buy Now at knix

Lastly, Knix’s Leakproof PJ Set is a match made in heaven for anyone currently scoping out gifts for a best friend, mom, wife, or girlfriend. Merging “splurge” with “necessity,” this set is composed of a modal rib tank, the Super Leakproof Dream Boxer, and three pairs of crew socks: made for those evenings when all you (or she) wants to do is devour a sweet treat with a guilty-pleasure show on.

Price upon publish date of this article: $93

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Meet the Author

Stacia Datskovska is a Senior Commerce Writer at WWD. Previously, she worked at ELLE DECOR as an assistant digital editor, covering all things luxury, culture, and lifestyle through a design lens. Her bylines over the past five years have appeared in USA Today, Baltimore Sun, Teen Vogue, Boston Globe, Food & Wine, and more. Prior to joining ELLE DECOR, Datskovska learned the ins and outs of e-commerce at Mashable, where she tested products, covered tentpole sales events, and curated gift guide roundups. She graduated from NYU with a bachelor’s degree in journalism and international relations. Datskovska regularly reports on the most innovative womenswear offerings and how to shop them.

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Forget Pads and Tampons — Knix Is Revolutionizing Period Protection With Its Viral, Leakproof Underwear

Recent Articles by Stacia Datskovska

Shop Knix’s Most-Loved Period Underwear

Knix Leakproof UltraThin No-Show Bikini

Knix Super Leakproof Dream Boxer

Knix Super Leakproof Dream Short

Knix Super Leakproof Cotton Bikini

Knix SuperPlus Leakproof No-Show High Rise

Knix Light Leakproof No-Show French Cut

Knix Light Leakproof No-Show Thong 3-Pack

Knix SuperPlus Leakproof No-Show Boybrief

Knix Super Leakproof Dream Boxer 2-Pack

Knix The Full Cycle Kit High Rise

Knix Leakproof PJ Set

Related Articles

Knix Leakproof UltraThin No-Show Bikini

Knix Super Leakproof Dream Boxer

Knix Super Leakproof Dream Short

Knix Super Leakproof Cotton Bikini

Knix SuperPlus Leakproof No-Show High Rise

Knix Light Leakproof No-Show French Cut

Knix Light Leakproof No-Show Thong 3-Pack

Knix SuperPlus Leakproof No-Show Boybrief

Knix Super Leakproof Dream Boxer 2-Pack

Knix The Full Cycle Kit High Rise

Knix Leakproof PJ Set

Why Trust WWD

Meet the Author

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