Period underwear for every teen from Kt by Knix
Options for every day, sports, sleepovers, and swimming
Credit:
Kt by Knix
Products are chosen independently by our editors. Purchases made through our links may earn us a commission.
Your teen’s first period can feel unpredictable—for both of you. Between school days, sleepovers, and after-school sports, it’s impossible to know when (or where) it’ll arrive.
That’s why so many parents are turning to period underwear as a reliable and comfortable alternative to pads or tampons. Kt by Knix, one of the best period underwear brands we’ve reviewed, has options for the pool, sports, and sleepovers, so your teen feels confident from their first cycle and stays that way.
Includes three light leakproof bikinis, three super leakproof no-show bikinis, one super leakproof sleepover short, and one reusable pouch. Choose sizes and colors for each pack.
What is Kt by Knix?
Born from Knix, the leader in leakproof period underwear, Kt was made just for teens—because every teen deserves to feel confident on their period.
Just like the leading brand, Kt offers period-proof activewear and swimwear specifically designed for teens, helping stop the cycle of stigma that keeps one in two teens from participating in sports just because of their period.
Period solutions for every moment
Period underwear gives teens the freedom to move with confidence, comfort, and security.
Period underwear
Your teen’s go-to for light days. These seamless period underwear feel weightless but pack the protection of one tampon or pad—perfect for class, hangouts, and everything in between.
The upgrade for medium-flow days. This pair absorbs more than the light version but stays lightweight and comfy without padding or bunching.
Handles the heavy days like a pro. These absorb up to three tampons’ worth, so your teen can focus on their day, not bathroom breaks.
Stock up and stress less. This 3-pack of period underwear delivers triple the comfort and protection, with each pair holding up to three tampons’ worth of flow. Perfect for rotating through busy weeks or overnight stays.
Period swimwear
Swim days made simple. Period swimwear means your teen can wear this alone on light days, or with a tampon or menstrual cup on heavy days, and it won’t leak when they’re in or out of the water.
With a mid-rise fit and fuller bum coverage, these period bikini bottoms offer serious protection (about 2–3 tampons’ worth) while feeling just like regular swimwear.
Sleepover shorts
Increased protection against leaks for a better night’s sleep. This relaxed-fit period sleep short feels like PJs but protects like period underwear.
Your teen’s comfiest pair, hands down. Made from buttery-soft Luxe Modal, this period sleep short offers all-day comfort and leakproof confidence from morning chill to bedtime.
Period activewear
For every workout, practice, or game day. These leakproof shorts absorb about two tampons’ worth, with a smooth, discreet liner that moves like a second skin.
These sleek period leggings combine full-length comfort with discreet leakproof protection your teen can count on all day.
How do you wash period underwear?
Good news: caring for Kt period underwear is as simple as doing regular laundry. Each pair is designed to be reusable and durable, so with the right care, they’ll last wash after wash.
Here’s how:
- Step 1: Rinse your teen’s underwear in cold water to remove excess liquid.
- Step 2: Toss it in the washing machine with similar colors—no need to separate from the rest of the laundry. Use cold water and mild detergent, avoiding bleach or fabric softeners.
- Step 3: For medium absorbency pairs, lay flat to dry. For high or super absorbency styles, tumble dry on low.
That’s it! No ridiculous care instructions required, and no need to return to the store every month to stock up on pricey tampons and pads.
Do teens actually like wearing them?
Absolutely. In fact, more than 280,000 teens have tried and loved Kt’s period underwear, and their feedback says it all. With over 8,500 five-star reviews, it’s clear these aren’t just a backup option—they’re the go-to.
And if your teen’s still unsure? Kt makes it easy to try. Because they’re, well, underwear, used pairs can’t be returned, but your teen can try their first pair risk-free for 30 days.
Are Kt by Knix period underwear worth it?
Yes! With innovative leakproof protection, proven comfort, and thousands of glowing reviews, Kt by Knix is the period solution parents can count on and teens actually love to wear.
Aren’t sure what to grab? You can’t go wrong with the discounted Kt First Period Kit.
Includes three light leakproof bikinis, three super leakproof no-show bikinis, one super leakproof sleepover short, and one reusable pouch. Choose sizes and colors for each pack.
Related content
-
The Best Menstrual Cups of 2025
best-right-now
-
feature