Excellent product, fits true to size.
Bought these for my daughter, she loves them. Keeps her comfortable and prevents any leaks on her heaviest nights.
Great service and great product.
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.
Cut-Out Back Period Swim Set - 2 Pieces
Stylish Coverage with Heavy Absorbency (Sizes 8-16)
Want cute cut-out style? Need sun protection? Looking for choice of bottoms? Want heavy protection?
We've got you covered.
This gorgeous matching 2-piece set will have your teen covered this summer not just for their period and for sun-protection, but it looks great, too! The matching tie top features coverage in the front and protects the shoulders, with a cute cutout at the back.
💖 What Makes It Different?
Unlike regular swim sets, our Cut-Out Back Set features:
✔ Cute cut-out back design
✔ Choice of bottoms (Original OR High-Waisted)
✔ Heavy absorbency period protection
✔ Matching tie top in black
✔ Removable mini modesty cups
✔ Front coverage & shoulder protection
✔ Removable side ties on Original brief
✔ High-Waisted option has StopLeak
✔ Sizes 8-20 (Teen & Adult)
That means stylish cut-out design PLUS your choice of period-proof bottoms — customised to your preference!
🏊♀️ Perfect For:
• Beach & pool days
• Heavy flow protection
• Cut-out back style
• Sun protection
• Teen & adult sizes (8-20)
• Customisable brief choice
• Confidence swimming on your period
🌸 What's in the Set:
• 1 x Heavy absorbency swim bottoms (choose Original with removable side ties OR High-Waisted with StopLeak)
• 1 x Matching tie top in black with removable mini modesty cups (coverage in front, shoulder protection, cute cutout at back)
🌿 Designed for Style & Protection
Created by a mum, designed for real periods.
Our Cut-Out Back Set uses:
• Same technology as our heavy absorbency period underwear
• PLUS a thin waterproof layer
• Choice of Original OR High-Waisted bottoms
• Removable side ties (Original brief)
• 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 beautiful teen Model wears a ladies size 8 in clothing and prefers size 12/14 in our Swimwear - her measurements are: Waist - 74cm & Hips - 91cm.
* To measure against another brand of swimwear please use the flat lay measurements - side seam to side seam along the waistband
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.
Excellent product, fits true to size.
Bought these for my daughter, she loves them. Keeps her comfortable and prevents any leaks on her heaviest nights.
Great service and great product.