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.
Knicked Original Period Swim Brief
Heavy Absorbency for Worry-Free Swimming
Period at the pool? Beach day during your cycle? Want to swim with confidence? Need heavy protection in water?
We've got you covered.
Our Knicked Period Swim Briefs are back and they've had an upgrade! With NEW thicker anti-pilling material, chlorine resistance and SPF50+ protection, these period swimmer bottoms are the perfect choice for the beach, pool, creek, river or just lazing around the backyard in summer.
💖 What Makes Them Different?
Unlike regular swimwear, our Period Swim Briefs feature:
✔ Heavy absorbency period protection
✔ NEW thicker anti-pilling material
✔ Chlorine resistant & SPF50+
✔ Thin waterproof layer prevents leaks
✔ Quick-drying outer material
✔ Removable side ties
✔ No extra period product required*
That means you can swim with confidence EVERY DAY of your period, in and out of the water - no standing on the sidelines!
🏊♀️ Perfect For:
• Beach & pool days
• Creek & river swimming
• Backyard summer fun
• Heavy flow days
• All-day water activities
🌿 Designed for Water Confidence
Created by a mum, designed for real periods.
Our Period Swim Briefs use:
• Same technology as our heavy absorbency period underwear
• PLUS a waterproof layer to prevent leaks
• Quick-drying outer material
• Removable side ties for versatility
• 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).

* 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.
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.