The Full Brief



Full coverage. Ultra supportive. Our go-to for a heavier flow.

Flow: Medium = 15ml / 3 regular tampons or Heavy = 20ml / 4 regular tampons.

Medium: useful for your entire period if you tend to flow light, or suitable from day 3 onwards if you flow on the heavier side. 

Heavy: if you have heavier flow, this is your go to! 

Try risk free for 60 days*

As a first-time customer, you can try one pair of undies for 60 days risk-free. If you don’t like how they function, we will happily give you your money back (minus the cost of shipping).

Unfortunately, garments that have been worn can no longer be returned due to sanitary reasons. And you know, the market for second-hand underwear isn't all that flash!

So, we will require a brief explanation of the reason for your request.  The trial applies to one worn garment only.

No further refunds, credits or exchanges can be given on any additional worn or washed underpants.

Out of stock items

Current waiting time for out of stock items: less than 2 weeks (14/11/23).

Shipment of your in-stock items may be delayed until your pre-order item is ready for shipping. To ensure faster delivery of your in-stock items, we recommend making two separate orders - one for your pre-order items and one for your in-stock items.


Formulated with organic cotton and nylon made from recovered ocean plastics, these underpants whisk moisture away from your body (and plastics away from the turtles!), keeping you dry and "good karma'd" all period long.


Find our size guide here

*Disclaimer: The Sleep Tight run a little smaller than our other sizes, if you are in between sizes we would recommend choosing the larger option. Should you have any questions, please email us on and our team will be happy to assist further. 

Shipping & Returns

Flat rate shipping on all AU orders $7.95

International shipping to New Zealand $15.00

United Kingdom and USA $25.00

All in stock items are dispatched within 1-3 business days (excluding weekends, public holidays and busy sale periods) and deliver in 3-8 business days. 

Our undies are delivered to you by Sendle – Australia’s first 100% carbon neutral delivery service.

You may return all other unworn garments in original unopened packaging for a credit or refund within 30 days of your purchase. View our full return policy here

Customer Reviews

Based on 13 reviews

They look flimsy not well made 😞

Tanya Wright
Very Discreet

These undies are super comfortable and the absorbency is really thin, they feel like regular undies.

Favourite Pair of Undies

I have tried multiple brands of period undies in search of the best fit and feel for myself, and Wunderthings has been an exceptional fit. These shape so nicely on my butt whereas other brands usually leave an indent :(

sizing fits a bit small

I absolutely love the undies! Finally some nice looking period undies. I bought 1 of each, they all have a good fit, work marvelous, but the sizing is a bit small, they have to be tight because of their 'job, but I find it just a bit much, maybe it's just because they are brand new...


Still missing in the post