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Color: Black
Best Seller

Color: Black

Size:

Size:

Size and Fit Guide

Mix & Match: 3+ for $20 each
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KnixTeen

Teen Leakproof Front-to-Back Liner Bikini

$40.00 CAD

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Absorbs about 2.5 super tampons

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Soft cotton-modal fabric

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Optimal overnight protection

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Machine washable

Amarii (she/her) has 39

Amarii (she/her) has 39" hips and is wearing a size L

| General
Amarii (she/her) has 39

Amarii (she/her) has 39" hips and is wearing a size L

| General
| General
| General

Amarii (she/her) has 39" hips and is wearing a size L

Color: Black

Size:

True to Size

Size:

Size and Fit Guide

Leakproof Underwear is Sales Tax Free in Canada*
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 40 Points

Comfort-First Fit

The classic mid-rise fit provides medium hip and bum coverage.

Moderate Absorbency

The quick-dry, extended liner absorbs approximately 2.5 super tampons worth of liquid.

Easy to Wash

Machine washable just like regular underwear.

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Amarii (she/her) has 39
| General
Amarii (she/her) has 39
| General
| General
| 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
4.4
Rated 4.4 out of 5 stars
Based on 46 reviews
Total 5 star reviews: 33 Total 4 star reviews: 4 Total 3 star reviews: 6 Total 2 star reviews: 2 Total 1 star reviews: 1
80%would recommend these products
ComfortRated 4.6 on a scale of 1 to 5
FitRated 1.0 on a scale of minus 2 to 2
EffectivenessRated 4.5 on a scale of 1 to 5
Ease of UseRated 5.0 on a scale of 1 to 5
46 reviews
  • Rated 4 out of 5 stars
    3 weeks ago
    Wow.

    Yes, it works, yes, you can wash it in the machine and use dryer. Yuk it's 90 or more every day here for weeks, so actually gets too sweaty after 6 hours, of course I am not using A/C in my home...so probably not a problem for most Americans.

    M S.
    Verified Buyer
  • Rated 2 out of 5 stars
    10 months ago
    Odd fit

    Same sizing as other models but fits very differently. Not as comfortable.

    Dina W.
    Verified Buyer
  • Rated 1 out of 5 stars
    11 months ago
    1 Star

    Fits very small

    Whitney
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    Effective Style

    Like fuller protection/coverage. Wish had more colors, as when first offered style. Fit very good.

    Arthur A.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    Amazing! The only period underwear you need!

    I have been looking this for my daughter ever since she started her period. Regular period underwear is great but this is better! Even with regular underwear she had to wear a pad up the back and across the top at night time. Also, she loves to lounge around at home, and I had to constantly tell her to sit up so her period would stay in the area of the padding. This eliminates this problem. My only comment - which I think others have stated too - is more cheek coverage. Then, it would be perfect. This is just fine too for light day, heavy days, and all the days in between.

    Laurie M.
    Verified Buyer
  • Rated 3 out of 5 stars
    1 year ago
    Not for me, but if for you... maybe try 1 size up

    The issue I keep running into with the full full coverage styles is that they'll be extremely tight in one area. This one for me was just too tight in the leg holes (although I do have pretty chonky thighs at the moment =/). There was just no give; however, the waist did fit okay this time (not like the Cotton Super Leakproof Boxer Brief I got a while back that were too too tight on my waist).

    If you're a little thicker in the legs/waist area, I would recommend trying 1 size up if this is the style u want.

    Crystal B.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    Great period underwear

    My daughter loves these, and they made her feel more secure during her period. Thanks for making a great product!

    Pamela S.
    Verified Buyer
  • Rated 3 out of 5 stars
    1 year ago
    Front to back coverage leaks out leg opening

    The idea of the front to back coverage is great, but because of the high cut leg openings they leak out anyway. Seems like just traded out one problem for another. Hip measurements are accurate when measured for corresponding teen knix sizing; waist is tight & leg openings gap from being high-cut style.

    Evelyn T.
    Verified Buyer
  • Rated 3 out of 5 stars
    1 year ago
    Just don’t fit right, still leak at leg openings

    I normaly wear sizeXXL in overnight dream shirts; these are tight to begin with at waist, but relax after a wearing a couple times. I tried tried these because of the extended gusset protection, but they just don’t fit me right (and the adult panties like these also don’t fit me well). Knix does not give any waist measurements to go by on any of their panties, you only go by the hip measurement & I think that is where the problem is. The leg openings tend to be wider than their other panty styles & the waist is tight & doesn’t relax on this style, so they leak out at the leg openings even though they give a longer gusset coverage.

    Evelyn T.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    Panties

    My great granddaughter loves them, because of the larger gusset. She is a stomach sleeper and a heavy bleeder

    Linda T.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    Good coverage

    No worries about movement.

    Lisa F.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 year ago
    Love these!

    Was completely skeptical but my daughter LOVES them!!

    Vicki K.
    Verified Buyer