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
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.
Neon Beat: 3-Piece Period Swim Set with BFFs Protection
Bring vibrant energy to the water with our Neon Beat Three Piece Swimwear Set! Designed to turn heads while delivering unbeatable protection, this stylish set lets teens and tweens swim, splash, and play with total confidence. Featuring striking retro-inspired colour blocking in hot pink, aqua, and classic black, paired with our black BFFs (2-in-1 Period Protection) which are hidden underneath to ensure you stay leak-free and stylish from the first splash to the last.
💖 What Makes It Different?
Unlike regular swim sets, our Neon Beat Three Piece features:
✔ Adjustable, comfortable straps and a stylish tie-back detail
✔ Vibrant colour palate
✔ Includes BFFs 2-in-1 period undies in black
✔ Heavy absorbency protection
✔ Can be worn without BFFs on non-period days
✔ No pads, no tampons, no worries
That means invisible period protection PLUS a stunning beach/pool look — double the use!
🏊♀️ The Style Highlights
• The "Invisible" Backup: This set includes our BFFs by Knicked—high-cut period undies designed specifically to be layered under your bikini bottoms. They provide a slim, secure fit that stays hidden while you swim. This set can also be worn without the BFFs on non-period days so double the use
🌿 What's in the Pack?
1. Colour block tie at the back bikini top
2. Matching High Waisted Bikini Bottoms
3. BFFs 2-in-1 Period Undies: The secret weapon! Wear them underneath for discrete, reliable protection during your period
Because Knicked Swimwear is designed for the girl who refuses to sit on the sidelines.
Knicked period undies have always been and will continue to be FREE FROM NASTIES such as PUL'S (plastics) or PFAS (chemicals).
No leaks. No worries. No limits. Just freedom.

How to wear:
These aren't your average undies - pull them on, then up high at the sides so they sit snugly and low under the belly for the best protection.
Care tip:
Wash before first use. Each pair comes in a reusable, waterproof, and odour-proof wet bag – perfect for storing your BFFs in your bag or when they're wet, waiting for a wash. Less waste, more wow.

Our teen model prefers a Teen 12/14 (adult 6/8)
Please use the flatlay measurements to compare to another brand or existing pair to select the correct fit and if between sizes or very tall we recommend sizing up.
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.