Meet BFFs - Your Teen’s New Bestie Flow Friend for All Period Emergencies
The world’s first 2-in-1 hybrid period undies that can be worn both in and out of water: under swimwear, leotards, underwear and everyday clothes – without leaks, limits, or worries.
Soft, Slimline but Seriously clever.
With our innovative stop-leak tech and comfy high-cut design, BFFs are made to block water from getting in and lock period flow from getting out - so your teen can dive in, dance, or chill out with total confidence.
BFFs are designed for any outfit and every activity, meaning fewer outfit changes, less stress, and more freedom, the ultimate SOS friend. If your daughter is awkward about wearing period undies, we've had mums tell us their daughters wear our BFFs under their regular underwear!
✨ Why BFFs are the ultimate emergency pair your tween/teen shouldn't be without:
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Wear under swimwear, leotards, leggings - you name it
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Super-discreet and ultra-comfortable
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Waterproof and leakproof - both ways
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Reusable, sustainable, and budget-friendly (savings of well over $60 alone when compared to purchasing period swimwear and then a pair of period dance & medium flow undies)
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.
No leaks. No worries. No limits. Just freedom.
Size Chart

The first image shows our teen model wearing a Teen 12/14 (adult 6 or 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.
Shipping
Tracked postage is $9.95
Express postage is $14.50
Orders over $99 receive complimentary FREE REGULAR SHIPPING
Exchange
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.