Your Official Guide to the Best Teen Period Underwear: Kt by Knix

A handy introduction to all the different styles of underwear that Kt by Knix offers.

If you’re new to getting a period, you likely have a few questions going through your head. One thing you might be curious about is, what is the best way to deal with this? There are a number of forms of period protection to choose from  —  pads, tampons (learn how to insert a tampon here), menstrual cups and period underwear for teens — and it can take some time and experimentation to figure out which one is right for you.

best teen period underwear

Chances are if you’re reading this, you’re interested in learning about the best period underwear for teens: Kt by Knix. If you’re unfamiliar, Kt by Knix is the little sister of Knix, one of the first brands in the world to champion leakproof underwear. Kt was founded in 2017 as a way to give teens their own space in the world of periods. Whether it’s their first cycle or their fifteenth, we believe every teen deserves period products that make them feel as confident as possible.

So How Does It Work?

Period underwear is designed with a leakproof gusset that’s been specially engineered to absorb period blood. Instead of a regular gusset (that’s a fancy term for the crotch area), Kt by Knix contains three layers of patented moisture-wicking fabric specially designed to pull liquid away from the body and trap it inside the underwear. 

Think of them as regular undies that come with a built-in pad. Only instead of throwing it out when you’re finished, you throw it in the washing machine and it comes out good as new. (Don’t believe us? Here’s a guide on how to wash period underwear.

best teen period underwear

What Makes Kt by Knix the Best?

Don’t take our word for it– read the reviews: 

“Kt by Knix leakproof underwear makes me feel like a million dollars.” - Degrassi Actress Jamie Bloch

May never go back to regular undies!” - Virginia

“They are great quality, super comfortable and definitely [do] what they are advertised to do! I will definitely invest in more pairs.” -Joe V.

What Does It Look Like?

In a single word? Cute. Kt by Knix period underwear comes in a variety of styles, all of which are available in vibrant colors and patterns that bring an extra burst of positivity to your period. Everyone’s flow and body is different, so depending on the type of coverage and absorbency you are looking for, some styles might be better suited to accommodate your flow than others. Here’s a breakdown of the different types of Kt by Knix underwear, so you can learn more about what we offer and figure out which style works best for you.

Read on: What is moisture wicking underwear?

leakproof bikini


The bikini style is as classic as it gets. With a slightly higher cut on the legs, it offers a a cheekier fit while retaining full coverage in the back. The waistband is slightly lower than other Kt by Knix styles. The bikini comes in two different absorbencies: leakproof (which holds up to three pads or tampons worth of blood) and super leakproof (which holds up to eight pads or tampons worth of blood).

leakproof boy shorts

Boy Shorts

The boy shorts are a sporty style that extend all the way to the top of the legs, offering slightly more generous coverage than our bikini underwear. They’re best for people looking for a relaxed style of underwear that offers a bit of extra coverage. Kt by Knix boy shorts come in two different absorbencies: leakproof  (which holds up to three pads or tampons worth of blood) and super leakproof (which holds up to eight pads or tampons worth of blood). 

More reading: Does caffeine help period cramps?

full-gusset bikini

Full-Gusset Bikini

The full-gusset bikini features an absorbent area that is extra long and wide to provide all bleeders with full front-to-back protection. It’s the largest gusset of any Kt by Knix underwear style, making it perfect for absorbing those weirdly-placed stains that happen from sleeping overnight. They can absorb up to eight pads or tampons worth of blood and are the ultimate choice for anyone who has a heavy menstrual flow and needs a wider absorbent area. 

sleepover shorts

Sleepover Shorts

The super leakproof sleepover shorts are period underwear in beast mode. They were specially designed to keep you leak and worry-free during sleepovers or sports practice and are the best option for heavy bleeders, able to absorb up to 12 pads or tampons worth of blood. The fit is slightly longer than the boy, hitting just past the tops of the legs. It's no wonder these heavy-hitters are one of our most popular styles. 

cotton modal super leakproof bikini

Cotton Modal Super Leakproof Bikini

The cotton modal super leakproof bikini is similar to our bikini underwear, but made from super soft cotton modal fabric. Modal is known for being incredibly breathable and absorbent, making it an excellent choice for anyone who lives an active (aka sweat-prone) lifestyle. Not to mention the silky fabric feels amazing against the skin, meaning you’ll want to wear it over and over. This style can absorb up to eight tampons or pads worth of blood.

Further reading: What is the average age for getting your period?

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