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 Adjustable Racerback Period Swimsuit
Heavy Absorbency with LeakSTOP Technology
Growth spurts? Tall or petite? Need a perfect fit? Want full coverage? Looking for squad-ready swimwear?
We've got you covered.
Our Knicked Period Racerback features adjustable straps allowing for those growth spurts or perfectly fitting for anyone tall or petite, PLUS using our new LEAKSTOP Technology which we created to STOP leaking over the gusset when out of the water soaking up some rays. White towel protection!
💖 What Makes It Different?
Unlike regular one-piece swimsuits, our Adjustable Racerback features:
✔ NEW LeakSTOP Technology (stops leaks around leg holes)
✔ Adjustable straps for perfect fit
✔ Heavy absorbency period protection
✔ Anti-pilling water repelling material
✔ Chlorine resistant & SPF50+
✔ Modesty cups included
✔ Quick-drying outer material
✔ No extra period product required*
That means total protection EVERY DAY of your period, in and out of the water - even when lounging on white towels!
🏊♀️ Perfect For:
• Swim squad & swimming carnivals
• School camps
• Beach & pool days
• Creek & river swimming
• Growing bodies (adjustable straps)
• Tall or petite girls
• Full coverage confidence
🌿 Designed for Active Swimmers
Created by a mum, designed for real periods.
Our Adjustable Racerback uses:
• Same technology as our heavy absorbency period underwear
• PLUS an extra waterproof layer
• PLUS NEW LeakSTOP technology around leg holes
• Adjustable straps for growth & fit
• Modesty cups (small slit on each side to remove if preferred)
• Made to keep you protected in and out of water
Because Knicked Swimwear 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).

* Please see our swim FAQs for more information.

Our featured teen Models wears a ladies size 6/8 in clothing and is shown here in our TEEN size 12/14 and last picture shows model wearing size 14/16 (ladies 10)
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 5yrs.
Tried these and they work perfectly; feeling super confident that there weren’t going to be any leaks.
My daughter has been apprehensive using any period swimwear in case they leak! But safe to say, she reported no leaks even after getting in and out of the pool a few times. Very happy teen!
My daughter plays water polo. But she would have to have a week out every month as we tried another brand and she leaked so didn't trust period swimwear - was recommend Knicked and she is now back in the pool full time with absolutely no concerns. If Knicked can save waterpolo it can save any other water based activity!
Only request is could you consider making a sport costume that is a much higher neckline than the racer, else it can cause drag in the water
Love the wide adjustable straps and coverage. My daughter dives and is always in the pool and these swimmers are the best period swimmers we’ve ever had.
Bought this for my 13 yr old who swims a lot. Fits well and she’s now doesn’t need to miss any classes. The delivery was quick and painless.
Bought the wrong size initially for our daughter. But Knicked has made it suoer easy to exchange to a new size - communications were attended to promptly, new order arrived within 2 working days with return package and as soon as our return was collected (unworn and still in original packaging) a refund was processed that afternoon. Thank you for such an easy process. Will definitely buy again.
Very good.
The racer back is brilliant. Very good fit, and lasted all day period wise! Haven't tried the other one yet. It was very quick to arrive, packaging was great. My daughter loved the scrunchy and glove gift!
My 12 year old says they are very comfy and work well. The padding in the bra area works well. It's a little lower than expected but is able to be adjusted.
These swimmers are amazing and have given my daughter the confidence to swim anytime she likes including competing in her school swim carnival with no leaking.
It definitely held my blood on my heaviest period days, the fit is a little loose when with the straps tightened but overall it’s very very good!
We ordered the black teen racer - size 12 for squads for my daughter. Our order was received very quickly and looks great on. Washes well and does the job perfectly. I wish this stuff was around when I was a young girl.
I bought these for my daughter before going on holidays. They looked fabulous on! She was nervous about using them, as she couldn't quite picture how they would work, but once she wore them she was so happy. She hates tampons, so this was such a fabulous purchase! Thank you :)
We brought the Racer back (Adjustable) as we do a lot of swimming and boarding in the ocean.
True to size. The costume looks lovely on and feels comfy. The material seems to be high quality, and my girl feels confident in them. We have not yet tested them whilst Aunt Flow is visiting. So will review again once we test out the protection the swimwear gives
The product works perfect for what it is (being a period proof swimwear).
However, I found its neckline a bit too deep :(
It's not too big of a concern because its only for a few days a month ;)