Thinx vs Knix Review

Thinx vs Knix

Underwear isn’t exclusively made for the ‘haute couture’ crowd. Instead, it’s supposed to feel relatable and inclusive. Considered a diversion of the ‘privatized’ world of women’s intimates, Thinx and Knix are looking to usurp the industry by introducing a more embracing approach to panties, bras, and loungewear.

You’d think both companies are pretty similar given their x-suffix, and you’d be somewhat correct. Both brands are quite popular online—but if you’re not familiar with them, we’ll debrief you with just the specifics. 

About Thinx 

Thinx vs Knix Review

Created by women for women, Thinx was the brainchild of founders Miki Agrawal, Radha Agrawal, and Antonia Dunbar. It wasn’t formulated on the grounds of pure money-making; instead, the brand was established as a direct response to the lack of effective, absorbent underwear suited for menstruation.

Best known for its wide collection of intimates, this New York-based company continues to break the cultural taboo surrounding periods, and they’ve been doing it circa 2013. Of course, their efforts haven’t gone unnoticed, as Thinx has been featured in several media outlets, including The Guardian and PopSugar. 

About Knix

Thinx vs Knix Review

Knix leads with the same kind of female empowerment. Established by Joanna Griffiths in Toronto, Ontario, this intimates brand prioritizes functionality and clean designs over frills and fauna. It’s best known for its Leakproof Underwear, which offers everyday protection against those pesky menstruation stains. 

Knix was founded to be ‘apologetically free,’ which is showcased through its bs-free undergarment line and diverse modeling team. Since 2012, their success has captured the attention of the media, including Glossy and WWD

If you’re well versed in the underwear shopping experience, you probably already know that these things don’t come cheap. Here, we have two of the hottest brands on the market, but what company should you ultimately opt for? 

Hopefully, this Thinx vs Knix review will help answer that question for you, as we’ll provide a side-by-side comparison of their products, customer feedback, and overall quality in a clean and concise format. 

What to Consider

Thinx vs Knix Review

Product Range

Aside from panties, Knix sells leggings, sleepwear, and sports bras. Thinx, on the other hand, only focuses on making underwear—but in various cuts and silhouettes. It’s important to consider what you’re currently in the market for, as you don’t want to hop from store to store. 

Target Audience 

If you menstruate, then you’re considered a prime candidate for Knix and Thinx. According to both of their company missions, they want to prioritize functionality when it comes to underwear. It’s definitely the two brands to opt for if you’re tired of lace, frills, and unpractical designs. 

Materials and Sustainability 

‘Shelf life’ is dependent on the materials used. Ideally, underwear should be flexible, durable, and body-conforming. A good set of undies should last a year or more if cared for properly. You should look to replace them every 6 to 12 months, as per several sources online.

Of course, with the widespread trend of sustainability, it may be important for some buyers to look for greener alternatives when it comes to undergarments.

Style and Fit 

As we mentioned before, underwear is supposed to be relatable. This means that all designs should come in a vast array of sizes. Fortunately, most inclusive underwear companies provide customers a quiz for personalized recommendations. On top of that, it’s usually a good sign if the brand in question has a diverse array of models for its product pictures. 


Nobody likes a shriveled, wrinkled pair of Brazilian briefs. In most cases, brands will provide care instructions on how to properly wash their undergarments. To help save time, a good chunk of underwear can be tossed in the laundry. 


All reputable brands have a website, but not all companies are accessible when it comes to purchasing their products. A good retailer will carry their inventory through several partnered retailers such as Nordstrom and Amazon. 

It’s also good if they have in-store locations where you can try their garments on. Of course, their prices must be reasonable too in order to accommodate budget-conscious customers. 

Thinx Super Hiphugger vs Knix Leakproof Bikini Review

Unless you love the risk of period stains, it’s best to opt for a pair of undies that provide full coverage. Case in point, the Thinx Super Hiphugger, and the Knix Leakproof Bikini both offer maximum protection for the heaviest of days. 

They’re flexible, absorbent, and pretty flattering since they come in a variety of colors. But here’s the million-dollar question, what set of panties should you opt for? 

Below, this Thinx vs Knix review has gathered a few salient points for each pair of undies. From quality to functionality, it’s ultimately up to you to crown the winning victor:

Thinx Super Hiphugger:

  • Features the classic brief cut with stretchy lace for the waistband 
  • Holds up to 5 regular tampons worth of flow
  • Made out of polyamide, elastane, and polyester (OEKO-TEX approved)
  • Available in 5 different colors 
  • Offered in sizes xxs to 4x 
  • Costs $40

Knix Leakproof Bikini

  • Comes in a mid-rise brief cut with a seamless design 
  • Absorbs 3 teaspoons of liquid 
  • Designed to be quick-drying and odor-resistant 
  • Made out of nylon, lycra xtra life, cotton, spandex, and Fresh Fit Technology
  • Available in 23 colors 
  • Offered in sizes xs to 4xl
  • Costs $17 (instead of the original $21)

Spending $40 on underwear may seem ridiculous, but it’s important to consider its overall functionality compared to a standard set of cotton briefs. For one, the Thinx version is designed to be more absorbent, which can help you save embarrassment during those long-hour days. 

The Knix Leakproof Bikini is also quite impressive in construction, but it doesn’t seem to hold much ‘flow’ compared to its competitor. But, on the one hand, it does come with anti-odor and quick-drying technology, which is a huge plus. 

At the end of the day, it ultimately depends on the heaviness of your flow. Do you bleed like the red sea? Or do things progress in an even, gradual nature for the next couple of days? Whatever you choose, both Knix and Thinx seem to be up to the task. 

Thinx Postpartum Set vs Knix BlissFit™ Maternity Kit Review

Giving birth is only half of the struggle. You can’t expect your body to go back to ‘normal’ after pushing out a baby.

Instead of resorting to sweatpants and an oversized tee, the Thinx Postpartum Set and the Knix BlissFit™ Maternity Kit provide support and coverage for breastfeeding mamas. Both options offer maximum absorption to catch any discharge, excess blood, and sweat.

By now, you’re probably wondering, ‘what’s the difference between the two?’ We’re so glad you asked, as this Thinx vs Knix review will provide a side-by-side look to help keep the decision-making process easy. 

Thinx Postpartum Set:

  • 1x Super Hiphugger (holds 5 tampons worth of flow)
  • 2x Hiphugger (holds 3 tampons worth of flow)
  • 2x Super Hi-Waist (holds 5 tampons worth of flow)
  • Made out of polyamide, elastane, cotton, and polyester (OEKO-TEX approved)
  • Available in black
  • Offered in sizes xs to 4x 
  • Costs $164 (estimated retail value of $197

 Knix BlissFit™ Maternity Kit:

  • 1x BlissFit™Leakproof Nursing Bra 
  • 1x BlissFit™Leakproof Nursing Tank
  • 1x BlissFit™Maternity Legging 
  • 1x CoreLove High Rise Panties 
  • Designed to be used during pregnancy and postpartum 
  • Made out of polyamide, spandex, lycra xtra life, cotton, and nylon 
  • Available in black
  • Offered in sizes s to xxxl+
  • Costs $161 (instead of the original $201

While the prices are quite similar, the items that you get with each bundle are drastically different. Those only interested in getting underwear may find Thinx as a more suitable option. 

It’s a great alternative if you’re looking for absorbent panties during your journey through parenthood. 

On the other side of the ring, the Knix version is an excellent option for mamas who want the full set. This includes leggings, bras, panties, and tanks. 

Both options seem to excel in functionality, quality, and value given the price. Ultimately, it all boils down to what you’re in the market for. 

Thinx Sleep Shorts vs Knix Super Leakproof Dream Short Review

There’s nothing more horrifying than waking up to a blood puddle on your bedspread. To help prevent those early morning nightmares, the Thinx Sleep Shorts and the Knix Super Leakproof Dream Short are designed to curb accidents as you toss and turn. Trust me, both options serve as a great alternative to the towel method. 

Unless you’re keen on buying both pairs, this Thinx vs Knix review will compare both of these shorts to help you settle on a final brand. 

Thinx Sleep Shorts:

  • Offered in a loose silhouette fit with an elasticated waistband and pockets 
  • Designed to hold 5 tampons worth of flow 
  • Made out of elastane, modal, cotton, and polyester (OEKO-TEX approved)
  • Available in black and gray 
  • Set in sizes xs to 4x 
  • Costs $52 

Knix Super Leakproof Dream Short:

  • Designed to be slim-fitting 
  • Holds over 12 tsp worth of liquid 
  • Built to be odor-resistant and moisture-wicking 
  • Made out of nylon, spandex, and polyester
  • Available in 3 different colors
  • Offered in sizes xs to xxxl
  • Costs $30 (instead of its original $38

So, what kind of sleepwear do you prefer to snooze in? Is it a pair of snug leggings, or do you opt for a super-roomy pair of boxers? Whatever you choose, I’m sure that Knix and Thinx can provide that ultra-comfy alternative during the heaviest of days. Both options offer a varying degree of absorbency. In addition, they come in two different fits. 

I think we can all agree that the Thinx Sleep Shorts and the Knix Super Leakproof Dream Short both provide complete protection during menstruation. Yes, this option is quite expensive compared to your regular set of sleeping briefs, but it definitely saves the stress of cleaning dried blood in the morning after. 

Thinx vs Knix: Quality

Thinx vs Knix Review

If constructed properly, a good pair should last through months of use. With that in mind, what materials should you be on the lookout for when it comes to buying panties? Fortunately, Thinx and Knix are considered the ‘cream of the crop’ within the industry, and both brands are quite transparent regarding the fabrics they use. 

Knix prides itself as a PFAS-free underwear brand. Jargon aside, it basically means that they don’t use any synthetic chemicals during their manufacturing process. Additives like fluorine are quite harmful when it’s in direct contact with the skin, which bodes especially true to the most sensitive areas of our body.

In terms of fabric construction, Knix uses a blend of cotton, spandex, and carbon for its gussets. These materials are both breathable, anti-bacterial, and odor-resistant, which can help you feel fresh for longer. 

If you’re wondering what makes their underwear absorbent, you can thank Knix’s integrated Fresh Fix Technology, which is a polyester layer that’s designed to trap moisture.

Thinx is also considered a ‘good-for-you’ underwear company, as all garments are tested for harmful chemicals. As you’ve probably already noticed from the products we covered so far, all panties are OEKO-TEX approved, meaning that it’s checked for environmental safety. 

Construction-wise, Thinx panties are made out of cotton, elastane, PU-laminated polyester. All gusset components are designed to be moisture-wicking, absorbent, and impermeable to help prevent leakage. 

Honestly, we need to give a full round of applause to Thinx and Knix. Compared to big-name retailers such as Victoria’s Secret and Fruit of the Loom, these two underwear brands provide ample information regarding quality control and the materials used. 

Thinx vs Knix: Price & Value

Thinx vs Knix Review

Long gone are the days of $10 underwear packs. Nowadays, it’s common to walk away with a $50 deficit when shopping at your local intimates store. But, can the same be applied to Thinx and Knix—or are they considered the more affordable alternative for budget-conscious customers? To answer this question, let’s do a bit of investigating. 

Thinx offers a price range of $24 to $159. It’s worth noting that a single pair of panties costs around $30, while bundles will obviously fall within the hundreds. Given the product quality, I’d say that it’s quite a steal. 

All of their designs are constructed to be flexible, durable, and super absorbent, which cannot be said for a majority of undies. On top of that, Thinx seems to be a crowd-pleaser, as hundreds of customers report that their sets are comfortable and effective during menstruation. 

Knix seems to be on the more affordable side of underwear, as their prices range from $18 to $125. A regular pair of panties can cost around $20 to $40, depending on the design. Like Thinx, it’s quite the bargain. 

Compared to a thin pair of cotton briefs, paying for an absorbent set of undies is worth the $10+ investment. That’s not just our take on Knix, as hundreds of happy customers attest to the brand’s quality and functionality. 

If you’re looking for our two cents, Thinx and Knix are definitely worth the splurge. Obviously, it all boils down to your allotted budget, as both brands are quite different regarding price. 

Thinx vs Knix: What Do Customers Think?  

Thinx vs Knix Review

Considered the most crucial segment of this Thinx vs Knix review, it’s important to look at some common customer feedback before settling in on a brand. I’m sure that most of you aren’t fond of the good ol’ tab shuffle, which is why we’ve summarized their ratings and testimonials in a clean and concise format. Let’s take a look down below. 

Thinx (on its website and on external sources): 

  • Super Hiphugger: 2,358 reviews with 4.8/5 stars 
  • Postpartum Set: 27 reviews with 4.8/5 stars 
  • Thinx Sleep Shorts: 1.256 reviews with 4.9/5 stars 
  • Amazon for the Women’s Hiphugger: 140 ratings with 4.4/5 stars 
  • Influenster: 106 reviews with 4.6/5 stars 
  • Trustpilot: 56 reviews with 2.7/5 stars 

Common customer feedback:

  • Comfortable and definitely leak-proof
  • Considered a lifesaver during heavy menstruation 
  • Most garments seem to fit true to size 
  • Helped to reduce bulkiness in terms of pads and diva cups

Knix (on its website and on external sources): 

  • Leakproof Bikini: 2,992 reviews with 4.6/5 stars 
  • BlissFit™ Maternity Kit: N/A 
  • Super Leakproof Dream Short: 415 reviews with 4.8/5 stars 
  • 203 comments with 2.4/5 stars 
  • Trustpilot: 125 reviews with 4.7/5 stars 
  • Better Business Bureau: 61 reviews with 1.54/5 stars 

Common customer feedback: 

  • Reportedly comfortable and soft 
  • leak proof for the heaviest of days 
  • Seems to fit true to size 

All in all, Thinx and Knix are both reputable companies to support, as positive reviews continue to trump the negative ones online. 

Thinx vs Knix: Promotions & Discounts

Thinx vs Knix Review

Looking to save some money? Fortunately, this Thinx vs Knix review uncovered multiple deals and sales offered on both brands. It’s encouraging to know that each retailer is quite avid when it comes to promotions, as they offer some cash-saving hacks from time to time. 

To keep things easy to read, this Thinx vs Knix review will provide the deets in point-form down below:


  • Offers a clearance section where prices are as low as $17 
  • Customers can get $10 by sharing the brand’s affiliate link with their friends and family 
  • 20% off sitewide Flash Sale currently happening


  • Get 10% off your next purchase by signing up for emails
  • Has a clearance section on its website 
  • In terms of its referral program, customers can receive $15 by sharing the brand’s affiliate link 

Both of these brands offer a fair amount of promotions and sales on their websites. With that in mind, have you settled on a winner yet? If not, this Thinx vs Knix review will quickly outline their shipping and return policies if you just need a bit more convincing. 

Thinx vs Knix: Shipping & Returns 

Thinx vs Knix Review

You know what they say: The devil lies in the details. In this case, it’s the shipping and returns policy. Before you settle on a brand, this Thinx vs Knix review will quickly comb through their delivery fees, available locations, and other important points that readers should take note of. 


  • Free shipping on all orders (if you make an account) 
  • Other subsequent deliveries entail a fee of $5 
  • Provides international shipping 
  • Issues a tracking number alongside a confirmation email 
  • Has a 60-day return policy with a free shipping label 
  • Issues regarding delivery and custom fees 


  • Free shipping on orders $75 or more
  • Standard delivery costs $7 to $8 depending on location
  • Offers international shipping 
  • Gives a tracking number to help customers monitor their order 
  • Has a 30-day return policy for unused clothing with a free shipping label
  • Issues regarding its exchange and return policy 

In encouraging news, both brands offer international shipping. Differences start to unravel when it comes to free delivery, as Knix seems to be a pricier option if you don’t want to pay for transportation costs. In addition, their return policies are polar opposites since their timeframes range from 30 to 60 days. 

Who Will You Shop With?

Thinx vs Knix Review

Thinx and Knix are the best that you can get when it comes to all-inclusive underwear. They’re both exceptional when it comes to quality and practicality. Honestly, it serves as your go-to for those ‘unleash the red sea’ days, as all of their designs are built to be absorbent and flexible. 

For those who are still impartial, perhaps a brief summarization of the two will help clear out some waters. 

Thinx serves as an excellent brand for customers who are only looking to buy underwear. Compared to its competitor, this company offers a wide selection of designs, ranging from Hiphuggers to thongs.

Knix, on the other hand, can act as a viable alternative for those in the market for other undergarments, such as tank tops and leggings. They’re much more affordable than Thinx, and they seem more adjusted to other targeted audiences, which is best shown through the BlissFit™ Maternity Kit. 

Again, we’re not here to crown any winning victors here. Our purpose is to inform any middle-of-the-fence reader of some notable points for each brand. Ultimately, by the end of this Thinx vs Knix review, you will walk away with a company that suits your needs (and, more importantly, your flow). 

Check out our other brand comparisons below:

Tumi vs Rimowa Review

Quip vs Sonicare Review

Fabletics vs Lululemon Review

Warby Parker vs Zenni Review

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