Knix Period Underwear Review
Last Updated: September 2021

Knix Review: Stylish, Effective Period Underwear

knix period underwear

Knix Leakproof Bikini Period Underwear

This comfortable, machine-washable bikini underwear features patented leakproof technology that absorbs up to 3 tsp of liquid – perfect as backup protection during your cycle’s heavier days, on its own for lighter ones, or for helping you deal with light bladder leaks.

Bundle and Save: Buy 3 and save 25%

Featured Product: Knix Leakproof Bikini Period Underwear

Price: $23 each

Bundle and Save: Buy 3 and save 25%The Knix Leakproof Bikini Period Underwear are machine washable and feel like regular panties. These particular panties can hold up to 3 tsp of liquid.

So they are fantastic for lighter to medium days or can be used as an extra backup for heavier days. They have quick dry technology to help pull moisture away from your skin and come in a wide variety of colors and styles.

Comfortable Period Panties

Ratings Breakdown


The materials they use are soft, durable, and flexible. These materials are also meant to last long term, which increases the overall potential quality.


They are a little pricier than some other brands of period panties, but may be more comfortable. So that may make their products increase in personal value.

customer experience

The panties are exceptionally moisture wicking while also keeping the body feeling dry.


Knix is much more transparent than most other brands regarding their quality assurance processes. Their products are designed for women of all shapes and sizes for increased comfort and functionality.

Who is Knix?

Knix was founded by Joanna Griffiths in 2013 as a possible solution to an underwear market that was underperforming for most women. She wanted there to be more and better options of lingerie that were comfortable, looked good, and were fully functional for everyday use. And in order for this to work, she had to make most of the line leakproof. 

In addition to making the Knix line leakproof and comfortable, Griffiths wanted to make them as ethical and sustainable as possible also. The Knix product line is all designed from their offices in Canada. However, they aren’t manufactured there.Best Period Underwear Test

They are manufactured overseas in China, Seoul, and Italy. But, this is one of the few companies that is transparent enough to tell consumers how the materials and facilities pass compliance. According to the brand, all materials and facilities are approved by:

  • WRAP – accrediting body for socially responsible factories in the sewn-products sector
  • SA8000 – quality assurance accreditation for social responsibility and accountability
  • Oeko-tex – a quality assurance body ensuring all products used in end products meet quality standards and do not contain toxic materials

While I do love all of this, and their transparency, I would love to see more about the sustainability of the materials they use also. Either way, it’s difficult to find even this amount of corporate transparency, so just this little bit already sets them apart from their competitors.

As an added bonus, they use real women of various sizes, shapes, and colors as their models. This speaks to their inclusivity and the fact that they want their products to work for any and all women. Which is a fantastic message to spread.


  • Different absorbency options
  • Multiple underwear designs to choose from
  • Soft, comfortable fabric
  • Machine-washable


  • The $23 price tag is more expensive than other period underwear options
  • Can feel a bit thicker in the crotch region, so may not be as comfortable for everyday wear

Knix Leak Performance

When I first ordered these I was concerned about the color. I wasn’t sure if the whole panty was going to be a lighter color or not. Luckily, the crotch region of their panties all have a black liner, which helped ease my mind in case of leaks. Knix Period Underwear Test

The first day I had a chance to wear them after receiving them was the 3rd day of my cycle. So, it wasn’t nearly as heavy as the first day or two. However, I didn’t feel or notice anything the whole time I was wearing them. There weren’t any noticeable odors or dampness, which was fairly unexpected.

I wore a pair of my other period panties the day after and there was a noticeable difference, even though my cycle was lighter. I detected a slight odor and they definitely didn’t wick the moisture to the same degree that the Knix panties did. 

Testing Performance Period PantiesI washed my Knix panties and wore them again on day 5. Once again, I felt absolutely nothing and it was beautiful! The panties have been worn and washed multiple times now and the performance hasn’t changed a bit. The fabric also still feels just as soft and smooth as when I first received them.

Knix Fit & Style

I had tried another brand of period underwear before, so I was excited to see if there was any discernible difference between those and Knix. Since they offered different styles of underwear, I wanted to try two different options to see if the fit or performance differed. So, I ordered the Knixy Lace Leakproof Bikini and the  Knix Leakproof Bikini Period Underwear

Once I placed my order, I was able to track it through my Knix account. While the tracking never updated past the “pending information” window, I did actually receive them in 7 business days. Which was within the normal delivery window expected, so there must have been a glitch in their system. But all’s well that ends well.Fit Of Knix Underwear

Initially, both pairs of panties fit a bit more snugly the first time. But, after washing and wearing them once, they fit beautifully. The brand actually mentions this is a normal thing for their products, so it shouldn’t have surprised me.

Even with that though, they were amazingly buttery soft and comfortable to wear all day. I love that they are seamless like most of my other regular panties, because I detest panty lines. They were also cooling throughout the day, so I hardly ever noticed they were there.

knix underwear crotch area

My only complaint was the thicker crotch liner. It just took some getting used to due to my regular panties not having this option. But, compared to the other brand of period panties I’ve tried, it’s actually much thinner. So, overall, these were a great find.

Are Knix Good Quality?

The fact that Knix uses facilities and materials that are quality-certified speaks volumes about their products. While they don’t offer a warranty on their products, they do seem to last a fairly long time. The fabrics they use in their product line are also known to have a longer lifespan than some of the other products more typical in lingerie.

These products include:

But, while the products are meant to last a long time, they aren’t all as great for the environment. So this is something to keep in mind if you are planning to purchase more eco-friendly products.

Are Knix Period Underwear Worth It?

Knix Period Underwear is a great find for those consumers that need and/or want a little bit more protection than traditional underwear provides. All of their underwear gives at least some moisture control and support. Whether you are someone who needs them for just some light period days, minor incontinence, or as an added barrier for those really heavy period days, they have something for you.

However, the prices can be a bit steep. So, once you’ve tried them and find the correct size, I would suggest purchasing their multipacks to help offset the cost. Or, in a lot of cases, they offer a discount if you purchase 3 or more of the same product, which is another good option to help keep Knix within your budget.

Either way, the products they have provided are a great service to most women out there and they are certainly worth a try. At least once.

Leakproof Bikini

Leakproof Bikini

$23$27($5 off)

Knix Coupons & Discounts

Knix offers a discount upon initial sign-up for their email list. Typically, this discount is 10% off your first purchase. They also offer free shipping on any orders over $75, after all coupons and discounts have been applied.

Knix also has their own rewards program called Top Drawer Rewards. As soon as you sign up you’ll get 25 bonus points. After that, you’ll earn points with every purchase that can be used towards discounts on future purchases. As an additional bonus, though, we just happen to have a Knix discount code you can also use.

Frequently Asked Questions

For anyone who is in the market for moisture-absorbing undergarments or swimwear, there are bound to be questions. This is especially true since this technology is newer to the marketplace. So, before you drop a lot of money on Knix products, we wanted to answer the most common questions in hopes of helping you find the best products for your particular situation.

What is their return policy?

Unfortunately, none of the Knix underwear products can be returned or exchanged. This is due to sanitary reasons, or so they say. I’ve been able to return underwear that didn’t fit with the original tags and packaging to other companies as long as the sanitary strip was still intact. So, this is fairly disappointing. Especially because it can be difficult to determine what the correct size really is until you try a product on.

On the upside, all of their other main products are returnable or exchangeable within 30 days of delivery. This doesn’t apply to facemasks, gift cards, accessories, gifts with purchase, or original shipping fees. And the only other exceptions are any orders purchased from the Knix Last Call section or orders getting a 20% discount or more. These items can either be exchanged or returned for store credit only.

How does period underwear work?

Knix period underwear works by using their Fresh Fix Technology. This technology incorporates 3 different layers of protection to help keep women clean and dry.

Knix Underwear Moisture Absorbing

The first layer is the Honeycomb layer which is made of 87% seaweed fiber and 13% modal. This layer wicks away moisture and odors into the middle layer. The middle layer is made of 100% polyester and is meant to keep the moisture and odors trapped until washing.

The third layer is comprised of a polyurethane film that creates a waterproof membrane. This membrane ensures that no liquids and/or overflow makes it onto your clothes.

How to Care For Knix Period Underwear?

According to the brand, they wanted to make their products as easy to use as possible. Luckily, this just happens to include washing them also. For the best results, wash all Knix products on cold with mild detergent.

They say that you can tumble dry low the Super Leakproof Underwear, but all other products should be hung dry when possible. You should never use fabric softener or bleach on any of their products. All of these simple steps will assist with increasing the longevity of the products.

Who might Knix be best for?

Knix products will be best for anyone in need of a little extra help with leaking. If you’re a woman who is menstruating, has occasional urinary leaks, or has recently had a baby, then their products are for you. Depending upon the product, different amounts of liquid can be easily absorbed and wicked away from your skin. 

How long does Knix take to ship?

How long Knix products take to get delivered will depend upon where they’re being shipped. Since they are a Canadian company, orders delivered within the country of Canada can vary between 3-15 days. This depends upon whether the consumer lives within the GTA, urban areas, or rural areas within Canada.

Knix Period Underwear Effectiveness

If the order is being delivered to the United States, they can be expected within 3-10 business days. And for international orders, the shipping can take anywhere from 10-25 business days. All of these shipping times are in addition to the 1-2 business days for the order to dispatch after being placed.

Does Knix offer financing?

Yes, Knix does offer a financing option to help consumers pay for their products. Since Knix products can be a bit pricier than other options on the market, they wanted to be able to appeal to a wider demographic. Therefore, they partnered with Afterpay to help achieve this.

For any orders over $35, consumers can choose the Afterpay option to split up their total into 4 payments, due every 2 weeks.

Do they have any other product offerings?

Yes, they do. While this review is about their fantastic period underwear, they have a few other product offerings that marry well with the underwear. Their current lines include:

Knix Period Underwear Summary

Overall, Knix period panties are a fantastic option for most women. As a highly transparent company, they are continually doing what they can to improve their products and diversify their offerings. The fact that their panties are seamless and buttery soft doesn’t hurt either. 

If you’ve tried other period panties before, then these seem to go one step further when it comes to feel, fit, and performance. While the price tag may seem a bit steep for a company that doesn’t offer returns or exchanges, their fitting system is pretty spot on. So, it’s difficult to say anything bad about giving them a try at least once to see what you think.

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