Your Bag

Your cart is empty

But you're full of potential..
Rewards Members Earn 0 Points

Suggestions

Top Picks

Super Leakproof® Dream Short

$40.80 USD
$48.00
15% off

Color: Tapestry Limited Edition

Revolution V-Neck Bra

$55.25 USD
$65.00
15% off

Color: Warm Sand

Uplift Push Up Bra

$68.00 USD
10% off Bra & Underwear Sets*

Color: Black

Super Leakproof® Dream Boxer

$48.00 USD

Color: Dark Cherry Stripe Limited Edition

Home / Shop All Teen / Teen Period Swim Sport One-Piece
KnixTeen

Teen Period Swim Sport One-Piece

$88.00 USD

Checkmark

Absorbs about 2 super tampons

Checkmark

Medium coverage

Checkmark

Sporty scoop neckline

Checkmark

Premium UPF 50+ fabric

Checkmark

Machine washable

| Wave Pool
| Wave Pool
| Wave Pool
| Wave Pool
| General

Absorbency: Moderate
Drop
Drop
Drop
Drop
Drop

Color: Wave Pool Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Get FREE Express Shipping on all orders $125+

Shipping

HOLIDAY SHIPPING

Give the gift of Knix! To receive your order by Dec 24th, please order by the following dates.

All States - Urban Centers (except Hawaii, Alaska)
Standard: Sunday, December 14
Express: Tuesday, December 17

Alaska, Hawaii & Rural
Standard: Wednesday, December 10
Express: Wednesday, December 10
Express shipping is unavailable for international orders:

Africa, Central/South America, and Caribbean
Standard: Wednesday, December 10

Asia, Australia, and New Zealand 
Standard: Thursday, December 11

Europe and the Middle East 
Standard: Thursday, December 11

United Kingdom, France, Germany, Netherlands, Switzerland, and Japan 
Standard: Monday, December 15

Please note: Weather conditions and carrier issues may cause delays. Delivery dates are not guaranteed.

Processing Time
Please allow 1-2 business days for our warehouse team to pack and ship your order. During peak periods such as sales, holidays and product launches, please allow up to 4 business days for us to process your order.

Delivery Time
For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines vary depending on location and do not include processing times.

Shipping Charges
Orders over $100* USD = Free standard Shipping (4-8 business days)**
Expedited = $4.99 USD (3-6 business days)**

Orders under $100* USD = $7.99 USD Standard Shipping (4-8 days)**
Expedited = $9.99 USD (3-6 business days)**

*After discounts, before shipping and taxes. Processing times not included in estimates.
**Military Addresses Excluded. Standard Military Address Shipping = $10.00 USD (est. varies per location)
Easy Returns within 30 Days

Returns

Returns

Free Returns

Knix covers the return shipping fees for exchanges and refunds initiated through our Return & Exchange Portal. Exchange orders initiated through our Return & Exchange portal are also eligible for free shipping within the USA and Canada. Please note, the shipping fees on your original order are non-refundable.

Return Policy

Return policy varies by product, please check if your item is refund or exchange eligible by viewing our full policy here.

Sale & Last Call

Items discounted below 30% are eligible for size exchange or store credit. Items discounted 30% and above are final sale – no refunds, store credits, or exchanges can be accommodated.
Rewards Members Earn 88 Points

Swim in Style

A sporty one-piece style featuring removable cups and an open racerback for added mobility.

Worry-Free Protection

Discreet, built-in protection that absorbs about 2 super tampons worth.

Stay Sun-Safe

Premium UPF 50+ fabric shields you from UV rays while you relax, swim, and play.

Zoom

| Wave Pool
| Wave Pool
| Wave Pool
| Wave Pool
| General

How to Choose?

Essential

Drop
Drop
Drop
Drop
Drop
  • • Everyday Wear
  • • No leakproof protection
  • tsp
    0 tsp

Heavy

Drop
Drop
Drop
Drop
Drop
  • • heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    about 8-14 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 4-7 super tampons
  • cup
    about 1.5-3 menstrual cups

Light

Drop
Drop
Drop
Drop
Drop
  • • light period days
  • • sweat
  • • discharge
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

Drop
Drop
Drop
Drop
Drop
  • • moderate period days
  • • light bladder leaks
  • • sweat
  • tsp
    about 4-8 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-4 super tampons
  • cup
    about 0.5-3 menstrual cups

Ultra

Drop
Drop
Drop
Drop
Drop
  • • extra heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    about 15-20 tsp
  • pad
    about 1.5-2.5 super pads
  • tampon
    about 7-11 super tampons
  • cup
    about 2-3 menstrual cups
LEAKPROOF SWIM WORKS IN LAYERS

Built-in protection that feels like nothing at all.

Looks just like regular swimwear. Non-swelling liner and patented no-show design.

Soft Top Layer

Top Layer

Smooth and comfortable liner in swimsuit fabric.

Explore Teen Best-Sellers

Teen Super Leakproof® Sleepover Short

$38.25 USD
$45.00
15% off

Color: Pink Bows Limited Edition

Teen Super Leakproof® Sleepover Boxer

$45.00 USD

Color: Pink Stripe Limited Edition

Teen Leakproof UltraThin No-Show Bikini 3-Pack

$65.00 USD
$72.00
Save $7

Color: Candy Heart/Pink Bows/Deep Blue Limited Edition

Teen Super Leakproof® No-Show Bikini

$27.00 USD
Bundle & Save: 3 for $75

Color: Mood Ring Limited Edition

Teen Leakproof UltraThin No-Show Thong

$24.00 USD
Bundle & Save: 3 for $65

Color: Pink Bows Limited Edition

Teen Super Leakproof® No-Show Bikini 3-Pack

$75.00 USD
$81.00
Save $6

Color: Candy Heart/Pink Bows/Deep Blue Limited Edition

Teen Period Swim Sport One-Piece

$88.00 USD

Color: Frosted Lilac Limited Edition

Teen Period Swim Bikini Bottom

$45.00 USD

Color: Lavender Mist Limited Edition

4.6
Rated 4.6 out of 5 stars
Based on 229 reviews
Total 5 star reviews: 181 Total 4 star reviews: 26 Total 3 star reviews: 11 Total 2 star reviews: 3 Total 1 star reviews: 8
91%would recommend this product
ComfortRated 4.7 on a scale of 1 to 5
FitRated -0.1 on a scale of minus 2 to 2
EffectivenessRated 4.5 on a scale of 1 to 5
Ease of UseRated 4.7 on a scale of 1 to 5
Write a Review (Opens in a new window)
229 reviews
  • Rated 5 out of 5 stars
    3 minutes ago
    Easier for teens

    My daughter loves this so easy and doesn’t have to worry during swim club.

    Heidi S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    20 hours ago
    Tissus parfait

    Le tissus du maillot est doux et tellement confortable! Il fait parfaitement.

    Catherine R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Great Purchase!

    Having this bathing suit is a wonderful boost for a kid new to having periods. I love what Knix offers and the way they do business!

    Julie B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Sporty style and Comfortable

    Functions as described with comfortable fit

    Chanta B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Superbe maillot

    Le maillot est parfait, il est très utile lorsque ma fille a de la natation pendant ses règles. Jusqu’à présent elle est très satisfaite! De plus il lui va très bien et on ne voit pas de différence avec un maillot d’entraînement habituel.

    Mélanie B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Amazing

    My teen daughter loves this suit--as a competitive swimmer this has been a game changer!

    Randall H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Fits well.

    The material is nice and durable. It as a good fit.

    Rebecca G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    Great for pre-teen to feel secure

    Ordered several of these for my daughter (11) for swim class and she loves them! they feel great and no leaks! (actually kinda amazing). I'll order more when she needs them, love them!

    Elaina A.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    Parfait

    Il est tout simplement parfait

    Chantal J.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    Swimsuit

    Excellent quality and true to size.

    Lida I.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    M.

    Nice quality. Didn’t try yet but the size match perfectly. Thank you for your business.

    Cosmin V.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    3 months ago
    Not good

    Period came right through ! No what I expected at all !

    Stephanie F.
    Verified Buyer
    Was this helpful?