Meet Knix: The Brand Making Functional Fashion Actually Feel Good

In an era when we're feeling pretty spoiled by so many great lingerie and shapewear brands, Knix still stands out for spectacular fit and comfort. If you don't already know, Knix makes wireless, hardware-free bras and seamless underwear—really good ones that don't cost a fortune. The brand also makes revolutionary period underwear that lets you keep your flow going when your actual flow hits. It's like someone finally cracked the code on designing for women's bodies as they actually are: human bodies.

Can a bra without seams actually hold everything up? Is the underwear really that comfortable and protective? Even if you know Knix from the brand's inclusivity-driven campaigns and cult status on social media, it's time to get the full story from seasoned brand reviewers who know their way around a bralette. Read along as we break down how we feel about Knix's fabrics, collections, and pricing—because when it comes to what goes under your clothes, the details matter.

So, What Is Knix?

Knix is a Canadian intimate apparel and activewear brand that's made a major splash in the United States. With its direct-to-consumer model, Knix makes picking out functional, well-made bras, panties, leisure apparel, and more refreshingly straightforward. It's easy to become a Knix convert after seeing their lively campaigns focused on inclusivity, innovation, and redefining what comfort actually means for women.

What Does Knix Sell?

Knix intimates and apparel aren't just revolutionary because they offer seamless, discreet support that holds you in all the right places without wires, tugging, and pinching. While that would be enough to earn our attention, Knix innovates beyond anything else in the industry by providing period underwear in virtually every cut and fit. Even the non-leakproof designs are innovative for their breathability and moisture-wicking technology. Here are the pieces that caught our eye.

Bras

The bestselling Revolution Bra put Knix on the map with 3D-fabric tech that supports without wires. With adjustable straps and multiple fits and necklines available, this boob-approved bra feels custom-made. We're also fans of the hardware-free LuxeLift Pullover Bra that lifts and supports while disappearing under clothes. Knix also has a wide range of other stellar bras including sports bras, bralettes, lace styles, contouring bras, and more—all using the same wire-free technology.

Leakproof Underwear

Designed for backup protection on heavy days and full protection on light days, these undies feature leakproof technology in French cut, thong, boxer, bikini, boyshort, and high-rise cuts. The variety means there's a perfect fit for every body type and preference. Whether you need subtle backup or full coverage, these styles deliver reliable protection. The technology seamlessly integrates into comfortable, everyday designs.

Period-Proof Products

Knix has a complete lineup of moisture-wicking, odor-fighting period underwear specifically designed for teens. Available in boyshort, boxer, and bikini cuts, these styles prioritize comfort and confidence during those formative years. The teen-focused designs offer the same innovative technology as adult versions but with fits that work for younger bodies. These pieces make navigating periods feel less overwhelming and more manageable.

Shapewear

Knix offers contouring, leakproof shapewear that gently hugs and sculpts instead of feeling restrictive. The top-selling Leakproof Contour Thigh Saver offers gentle tummy support and prevents chafing while absorbing liquid equivalent to three pantyliners or three regular tampons. Other standouts include Shaper High Rise Leakproof Briefs, LuxeLift Slip, and Customizable Shaper Thong Body Suit. We love these because they're surprisingly cooling and comfortable for all-day wear.

Swimwear

Knix carries its intimates and shapewear technology into gorgeous, streamlined swimsuits. Leakproof bikinis, one-pieces, tankini tops, and swim shorts come in cuts, colors, and finishes for every taste. Some of our favorites include the ultra-sleek shimmer triangle bikini, one-shoulder styles, ruched long-sleeve swim tops, and leakproof swim skirts. The technology means you can swim with confidence during your period without any additional protection.

Tanks

Knix makes exceptional tanks—and bodysuits that look like tanks—designed for stylish performance. The HiTouch Active Contour Tank, one of our favorites, has a sewn-in shelf bra and barely-there moisture-wicking fabric that keeps you dry and comfortable. These pieces work seamlessly from workout to casual wear. The built-in support means you can skip the bra while still feeling secure and supported.

Loungewear

The matching pajama sets and loungewear pieces are refreshingly cooling and lightweight. The Luxe Modal Leakproof Sleep Boxer is comfortable and stylish while eliminating leak anxiety during heavy flow nights. These pieces prioritize comfort without sacrificing style or functionality. The breathable fabrics and relaxed fits make them perfect for both sleeping and lounging at home.

Maternity and Postpartum Collections

Knix's maternity collection features sizing flexibility to adapt to your changing shape—and transforms beloved, bestselling bras into nursing versions. The Revolution Nursing Bra and nursing tank are essentials for new and expectant mothers. These pieces grow with your body throughout pregnancy and beyond, making them a smart investment. The nursing-friendly designs offer easy access while maintaining the same supportive, comfortable fit Knix is known for.

The Knix Origin Story

What started as one woman's frustration with leaky periods turned into a revolution in intimate apparel. Back in 2013, Joanna Griffiths had a bold idea: what if underwear could actually handle your period without the backup of tampons or pads? It seemed almost too good to be true, but that's exactly what made it worth pursuing.

Rather than pitch to traditional investors who might not understand the problem, Griffiths took her concept straight to the people who needed it most. Her crowdfunding campaign didn't just raise money; it proved that women everywhere were desperately craving intimates that worked with their real bodies, not against them. The response was so overwhelming that Knix made history right out of the gate, becoming the first lingerie brand to feature real women of all ages, sizes, and backgrounds as models on its website—a move that felt revolutionary at the time.

The early success caught the attention of Hudson's Bay, which quickly brought Knix into retail locations. But Griffiths had bigger plans. In 2016, she pivoted the company to direct-to-consumer sales, prioritizing size inclusivity and building genuine relationships with customers over traditional retail partnerships. This wasn't just a business decision, it was a mission to serve women who had been overlooked by the industry for too long.

By 2017, Knix expanded its innovation to the next generation with Kt by Knix, a teen-focused period underwear line that approached a traditionally awkward topic with refreshing openness. The brand's momentum continued to build, ultimately attracting Swedish hygiene company Essity, which acquired an 80% stake in 2022 for $320 million—proof that what started as a crowdfunded dream had become a legitimate force in the intimate apparel industry.

What's the Knix Vibe? (Aesthetic & Brand Personality)

Have you ever heard that a spider's silk is actually many times stronger than steel? It comes down to natural silk's tensile strength and flexibility that allow it to absorb force and stretch without breaking. To us, that really embodies the quiet strength of Knix's designs. They feel as soft and airy as a spider's web while being durable like steel. Knix's nearly invisible fit and strong performance are perfect for those who value confidence, movement, and softness.

Knix is for you if you like comfort-first, modern minimalism that lets you honestly forget you're even wearing "support wear." While Knix offers a wide range of colors and a few patterns, the brand's overall color palette is mostly neutral with the occasional bold pop of color—there's even shimmer and metallic finishes in the swimsuit lineup.

Lines are clean and contouring. Meanwhile, silhouettes are seamless and gentle without any of the "lumping" or "bunching" you get with some brands that use compression for shaping. We love the soft, buttery, whispering-against-your-skin fit Knix creates.

Of course, it's hard not to appreciate Knix's empowering, authentic brand personality. Rather than being "body-positive", Knix is "body-neutral", meaning that the brand simply makes products for real women without making a big deal about the right or wrong way to be in your body.

How Much Does Knix Cost?

Did we really skip the best part until now? Knix is affordable—really affordable—compared to nearly every other shapewear and lingerie bra in the same class. While we're sure you'll find cheaper pieces at big-box stores, the quality-to-price ratio based on Knix's durability and fabric technology is unmatched. 

Here's a general roundup of our experiences with Knix prices:

• Bras: $25-$65
• Underwear: $22–$35
• Shapewear & Tanks: $35-$59
• Thigh Saver Bottoms: $44-$48
• Swimsuits: $28-$100
• Maternity/Postpartum: $45-$65
• Teen Period Underwear: $20-$50

There are several ways to save on Knix orders. First, clearance or "warehouse" sales give 25% to 50% select items. There are also three-pack bundles for underwear for about 20% off. Knix also offers occasional promos and seasonal sales with many bestselling items 25% to 40% off. For example, you get deep discounts on anniversary sale styles. You can also save on an order any time of year with a Knix coupon. 

Why We Love Knix: Our Take

It's probably no surprise that the Knix Leakproof Bikini reached #1 on our definitive roundup of Top 10 Period Underwear. Knix quiets period drama and self-conscious self-talk by making it possible to dress for real bodies in stylish, comfortable bras, underwear, and intimates. Knix's size inclusivity, which ranges from XS to XXXL and bras up to 42G, is a refreshing change from the lip service of many lingerie brands when it comes to inclusivity—there's even customizable shapewear. Of course, none of that would matter without the true all-day comfort and flattering designs.

If You Love Knix, You’ll Also Love…

With this being a great time for high-performance shapewear and "relatable" intimates, Knix has some company. Look no further than our recent roundup of the Top Ten Front Zip Sports Bras to know that we've been relentlessly pursuing the best undergarments around for a while. 

Based on our deep dives with product reviews and try-ons, here's a look at brands you'll love if Knix meets your needs:

• Skims:
  The Skims lineup of elevated basics with inclusive sizing is very in line with Knix. Both brands set the bar for innovative fabrics and seamless, invisible-under-everything fits.
• Parade:
  This body-positive brand serves bold colors and youthful vibes with super-supportive bras, bralettes, swimwear, and apparel. We're fans of the seamless design, inclusive sizing, sustainability initiatives, and budget-friendly pricing.
• Aerie:
  A great go-to for affordable, accessible bras, underwear, loungewear, and activewear, Aerie offers a good mix of heavy-support and light-support bras. Shoppers can find tons of sales and discounts on a regular basis.
• CUUP:
  Doing inclusive sizing like essentially no other brand out there, CUPP offers 67 sizes, A-H cups, and 30 to 50 bands. The brand has even figured out how to make strapless bras stay put on every figure. It's a top choice for elevated lingerie with a minimal aesthetic.
• TomboyX:
  This Seattle-born brand creates gender-inclusive, comfort-first undergarments made using sustainable fabrics and production technology. Bra and underwear collections focus on softness and full coverage.

Is Knix Worth It? Our Final Thoughts

We came for the seamless, barely-there bras—and stayed for the leakproof underwear. We’re so impressed with the brand that we even made a curated Knix Gift Guide. Honestly, Knix has cracked the code on what undergarments should feel like, do, and cost. The brand sets itself apart with high-end fabrics, thoughtful design, and innovative technology that delivers an ultra-natural fit. With comfort-first pieces that actually perform (hello, period-proof panties), Knix makes everything from travel to postpartum and everyday life feel a whole lot easier—and a lot more empowering.