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Color: Black
Best Seller

Color: Black

Size:

Size:

Size and Fit Guide

Mix & Match: 3+ for $20 each
Rewards Members Earn 0 Points
Best Seller

Teen Period Swim Short

$60.00 CAD

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Absorbs about 2 super tampons

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High-rise fit

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Full coverage style

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Premium UPF 50+ fabric

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Machine washable

| Marina
| Marina
| Marina
| Marina
For this style, we recommend going one size up. | General

For this style, we recommend going one size up.

Color: Marina Limited Edition

Size:

True to Size

Size:

Size and Fit Guide

Free Shipping on orders $100+

Shipping

Shipping
Processing Timelines

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* CAD = Free Shipping (2-6 business days)
Orders under $100* CAD = $12 CAD Shipping (1-3 business days)
Orders delivering to NWT, Nunavut and Yukon are subject to $20 delivery fee.*After discounts, before shipping and taxes.

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 60 Points

Swim in Style

A comfortable high-rise bikini bottom with a wide waistband and maximum bum coverage.

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.

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| Marina
| Marina
| Marina
| Marina
For this style, we recommend going one size up. | 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
    6-11 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 3-6 super tampons
  • cup
    about 1-2 menstrual cups

Light

Drop
Drop
Drop
Drop
Drop
  • light period days
  • sweat
  • sweat and 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 3-6 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-3 super tampons
  • cup
    about 0.5-1 menstrual cups

Ultra

Drop
Drop
Drop
Drop
Drop
  • extra heavy period days
  • overnight protection
  • light bladder leaks
  • tsp
    13-17 tsp
  • pad
    3.5-4.5 regular pads
  • tampon
    7-9 super tampons
  • cup
    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.

4.5
Rated 4.5 out of 5 stars
Based on 226 reviews
Total 5 star reviews: 163 Total 4 star reviews: 34 Total 3 star reviews: 10 Total 2 star reviews: 7 Total 1 star reviews: 12
87%would recommend these products
ComfortRated 4.4 on a scale of 1 to 5
FitRated -0.1 on a scale of minus 2 to 2
EffectivenessRated 4.4 on a scale of 1 to 5
226 reviews
  • Rated 5 out of 5 stars
    3 days ago
    peroid short review

    Were very good for swimming lessons and for spending a whole day at the beach

    Emily G. G.
    Verified Buyer
  • Rated 5 out of 5 stars
    4 days ago
    Great!

    My kids love these.

    Lia D.
    Verified Buyer
  • Rated 3 out of 5 stars
    1 week ago
    Bit tight for sleepwear

    More like underwear

    Tara T.
    Verified Buyer
  • Rated 5 out of 5 stars
    2 weeks ago
    A must for tween girls

    My girl is small so it’s hard to find period anything that fits. This fits her perfectly and provides great coverage. It is not bulky at all either. Will buy more.

    Len d. C.
    Verified Buyer
  • Rated 5 out of 5 stars
    3 weeks ago
    Amazing

    We love these!

    Roxanne K.
    Verified Buyer
  • Rated 5 out of 5 stars
    3 weeks ago
    Go To Period Swim Short

    Love these swim shorts and mostly use them under board shorts. Never had a leak and never missed a day of water sports due to my period but I do plan well.

    Mihal L.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Great coverage no leakage

    Absolutely great for my daughter. This is a no brainer for girls and women these days! Girls can feel secure and comfortable without worrying about tampons all summer long.

    Stephanie M.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Swim short for teens

    My grand daughter loves them. The fit is perfect.

    Ruth B.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Great, comfy and good coverage

    Thick material, good bathing suit

    Love the pattern

    Carolyn W.
    Verified Buyer
  • Rated 5 out of 5 stars
    2 months ago
    My daughter likes them

    They seem to work pretty well and allow her to keep swimming even during her eriod, she finds them comfortable,

    ROSE R.
    Verified Buyer
  • Rated 5 out of 5 stars
    2 months ago
    Good fit for my tween

    My daughter isn’t quite ready for other period products so this was the perfect solution for summer. They fit well and she seems comfortable. I’m glad this product is out there.

    Sheena F.
    Verified Buyer
  • Rated 5 out of 5 stars
    3 months ago
    Great product!

    We recently exchanged the twist high waist bottoms for these shorts and they are really great quality, comfortable, and they fit my 11 year old daughter really well! I love that Knix makes sizes for younger girls because a lot of the period swim wear out there is made for teenage girls or adults. I also love that they have the swim shorts option because sometimes the other bottom styles can be too revealing. Love these!

    Stefanie S.
    Verified Buyer