How to make your daughter's first period EASY and FUN!CLICK HERE TO READ.
Welcome to Knicked, Welcome to Puberty and Periods SHOP HERE
Terms & Policies
Please see each product page, for individual sizing.
As a general rule, please choose the same size for our period undies and period swimwear as your child's regular underwear size.
Our period underwear is designed here using Australian Child/Youth underwear guidelines. It's important to note that child sizing, also crosses over into women's sizing at our 12/14, so we have also shown this on our sizing charts (on each individual product page) to assist.
We also understand purchasing online can make judging sizing difficult and everyone has a different body shape (literally hundreds of waist & hip combinations) so we have created guides on each product page to help you choose the best fit for each product, or feel free to email our helpful team at theteam@knicked.com.au with waist & hip measurements so we can assist further.
To measure against existing underwear: use the flat lay measurement (side seam to side seam on the waistband) to compare with their current underwear.
Don't panic if you do find you've ordered the wrong size, KNICKED will happily exchange sizing and also cover the postal costs to reship (once per order) as long as underwear has been tried on over clean underwear and returned in AS NEW condition (not washed/worn free of lint/hair/marks), and packaging in original condition.
Please click here for our Exchange/Refund Forms & Guidelines to organise an exchange.
Knicked Self-Tie Period Swim Bikini
Heavy Absorbency with StopLeak Technology
Want the perfect fit? Need adjustable coverage? Looking for bikini-style period protection? Want heavy absorbency in water?
We've got you covered.
Our Knicked Period Swim Tie Bikini briefs tie up on the side to ensure the perfect fit for everybody! They're a bikini cut with bottom coverage, and we've updated our ever-popular self-tie bikini to now have StopLeak technology so they're even better than EVER.
💖 What Makes Them Different?
Unlike regular bikini bottoms, our Self-Tie Period Swim Bikini features:
✔ Heavy absorbency with StopLeak technology
✔ Self-tie sides for the perfect fit
✔ Bikini cut with bottom coverage
✔ Thin waterproof layer prevents leaks
✔ Quick-drying outer material
✔ Fits all bodies (XS-S & M-L)
✔ No extra period product required*
✔ Medium to heavy flow protection
That means adjustable, comfortable protection that fits YOUR body perfectly - no standing on the sidelines!
🏊♀️ Perfect For:
• Beach & pool days
• Medium to heavy flow
• Adjustable fit for all bodies
• Bikini-style coverage
• All-day water activities
• Confident swimming on your period
🌿 Designed for the Perfect Fit
Created by a mum, designed for real bodies.
Our Self-Tie Period Swim Bikini uses:
• Same technology as our heavy absorbency period underwear
• PLUS a thin waterproof layer with StopLeak
• Quick-drying outer material
• Adjustable ties for custom fit
• Made to keep you protected in and out of water
Because Knicked Swim allows girls to NEVER miss out on the fun when it comes to the water.
Knicked period undies have always been and will continue to be FREE FROM NASTIES such as PUL'S (plastics) or PFAS (chemicals).
Important: Your bikini bottoms must remain tightly tied to ensure no water can enter/exit the absorbency area.

* Please see our swim FAQs for more information.

Our beautiful teen models both wear a ladies' size 6-8 in clothing and are modelling the XS-S in this style
Tracked postage is $9.95
Express postage is $14.50
Orders over $99 receive complimentary FREE REGULAR SHIPPING
Knicked will exchange item(s) that have not been washed, worn and are in AS NEW condition, we request you submit our Exchange Form within 14 days of receiving your product. Knicked will cover one new shipping cost as a gift to assist - please note: if purchased on sale or outside Australia item(s) can ONLY be returned for a gift voucher to repurchase a new size or style within 3yrs.
Excellent bikini bottoms and look like normal swimwear. Very impressed and would highly recommend.
Super seamless and lovely fit
Cute, discreet, quick postage
Thanks
They fit really well and look just like normal bikini bottoms
So so handy x
Awesome, my daughters love them
I was worried that these bathers wouldn't be secure enough to 'do the job' but they are just as effective as the regular bather bottoms that we bought last summer.
Knicked - you have saved my daughter's summer days again!
Will be buying again, great swimmers.
Very good
Well made and quality fabric. My daughter loves hers, saying they work so good and are really comfy.
Amazing, thank you sooo much
My 15 year old was so worried about summer and she went a whole week with the bottoms and had no leakage at all even on heavy days!!
My daughter was really pleased to receive these bather bottoms and find out that they look just like her normal bikini bottoms. No more missing out on summer fun this season!
Needed to size down - we bought a small but my daughter actually needed an XS, they are on the bigger side.
I'm so happy with this purchase!! not only is it comfortable and looks flattering on, but there is no leakage at all. Amazing product :))
Love it!
Easy to order, quick delivery, and sizing very flexible. Good quality and versatile swimmers.
Got them for my 2 girls age 13 and 18 they have change the way we can now do so much with planning our holidays very happy no my worrying about that time of the month life changing
My daughter recently got a pair of these and loves them. They look great and she said they were comfortable. She is a women’s size 8 and the S/M fit her perfectly. Customer service team were prompt and helpful. Thank you :)
Fantastic bathers, look stylish, fit perfectly and you would never know they were period bathers. Love them
so comfy and not noticeably different xx
My 15 year old daughter has quite heavy periods and I can confidently say that the self tie bikini bottoms did the trick, no leakage, for hours and hours at the beach each day. Escellent product, fit was excellent and couldn't tell it wasn't usual bikinis. great job.
MU daughter was so happy with these as they look just like normal bikini bottoms
My daughter is in love with these swim pants she felt confident in the water wearing them and would like more in the near future
My fashion-conscious 14 year old LOVES these bikini bottoms. We live on the coast and so she basically lives in swimmers all weekend. These lasted all day with no 'leakage' issues which is fantastic. She loves the look of them so much she wants to wear them even when she isn't on her period.