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.
*NO EXCHANGES and NO REFUNDS on these clearance products, so please choose carefully! *discontinued style or the last one in a size.
Our Sleep Shorts are super heavy absorbency and are designed for those with very heavy periods whether you're a front, side or back sleeper, because we've turned absorbency on its head!! In a first for boyleg period undies these menstrual shorts offer absorbency in all 4 directions - front, back, side, and even down the inside leg. Our Period Sleep Shorts are underwear AND outerwear! (You don't need to wear extra undies underneath).
These are a relaxed fit designed for comfort while sleeping so are not as tight fitting in the legs as our boyleg/UltraGuard shorts please note you will receive a product that is tagged a smaller size to rectify them being too wide in the legs the size chart has been adjusted reflect this so please ensure you use the chart to select the correct size.
Knicked Period Undies are best for your body and best for the planet; and this style is pure period convenience and comfort in your favourite boyleg style.
Knicked period undies replace the need for regular knickers, panty liners, bulky sanitary pads, awkward and uncomfortable tampons, and silicon cups, and are the only way to feel 100% protected and secure knowing your daughter won't leak or emit odour ... pure peace of mind!
Knicked period undies have always been and will continue to be FREE FROM NASTIES such as PUL'S (plastics) or PFAS (chemicals).
Tweens and Teens Period Sleep Shorts are made from a super soft cotton-like blend with heavy absorbency, the perfect undies for super-heavy period days and all-day protection.


* To measure against another brand of underwear please use the flat lay measurements - side seam to side seam along the waistband.
As this is a clearance item no exchange on sizing is available - all sales are final
What a relief to have these so my tween feels comfortable and protected during the night! She says they are so comfy to sleep in and she thinks she sleeps better with them on during her period!!!
Teen loves them and very comfy
Teen loves them and very comfy
My teen is super happy with your shorts! Thank you for all you do
I purchased a size too big, however they are amazing quality and my daughter is looking forward to using them in the near future. We purchased some briefs as well and they fit great.
Thank you for this product. My tween daughter gets reasonably heavy periods and was finding her regular period undies leaking/wicking on the inner leg. Ideally she would love to make it through a school day without having to change her period undies. These have been great and got her through. She is happy she can wear them under her netball dress too. Thank you!
Teen Period Sleep Shorts ~ Super Heavy Absorbency
Postage was quick. Very well made product. And fit my very slim 10 year old well!
My daughter loves these .. buying them a size smaller was perfect .. she washes them herself in a specific bucket after every use as suggested/recommended.
I have bought a lot of period underwear from here and these by far are the best ones for comfort that my daughter has. She said she loves them so much she doesn’t want to take them off. I’ve gone and ordered some more of these since she loves them. No more leaks during the night from the sides of her knickers. These are definitely better for sleeping when she is having a heavier night.
These shorts are both comfortable and functional. My daughter loves them and is so pleased to have something to wear that she feels will protect her and give her the confidence to attend camps etc.
Amazing product from a even more amazing company!!
Bought these for my daughter to use during camp as she was due to start on the second day and we were worried about leaks during sleep, but these did not leak at all! They were so comfy as well.
My 12 year old daughter said they were the most comfortable pair of underwear she had ever worn.
And no more overnight side leaking. Winning!!!
Fabulous product for a pre teen to use
Love these sleep/ period shorts for my daughter. We no longer have to worry overnight. She feels confident which is so important.
Perfect for my self conscious 13 year old!
Thank you
These shorts are comfortable for overnight. They give our daughter the security she needs to relax and get a good night sleep while wearing these. They are equally great for sports and heavy days.
These shorts are comfortable for overnight. They give our daughter the security she needs to relax and get a good night sleep while wearing these. They are equally great for sports and heavy days.
Great product to wear to school under uniform
Teen Period Sleep / Leisure Shorts ~ Super Heavy Absorbency
My daughter loved these. Said they were so comfy and definitely wants more!
Teen Period Sleep / Leisure Shorts ~ Super Heavy Absorbency
My daughter finds these shorts so comfy. She can wear them all day to school on heavy days or overnight and no leakages. They look great and give her confidence. Will buy more as she grows.
These are fantastic for when my daughter has a shift at her busy workplace on heavier days. She doesn’t have to stress about being on her feet and getting embarrassed.
Just purchased this for my daughter along with the 1 piece swimmers...loved it. Highly recommend it.
I purchased these shorts as a 'just in case' item but now super glad I did. My daughter uses them at night when nothing else seems to work. She is off to an action packed school camp and can wear these under her casual shorts without any fuss. I am so glad she now has the confidence to get in and have lots of fun.
My granddaughter is really pleased with these.
She finds them very comfortable
Miss 12 loves her Sporty Shorts. Can’t wait to get more. She wants to wear them all the time.
This is the third brand of period underwear my daughter's have tried and it is by far the best. Both my girls experience heavy flows, and they have both had embarrassing leaks when wearing the other leading brands. They find this underwear more comfortable to wear and they feel more confident in them. Most importantly, they have had no leaks! I'm so grateful that we found these and Caro has been incredibly helpful.