All Underwear

Get into undies that make you feel unstoppable. From ultra-soft fabrics and seamless styles to super absorbent period and incontinence underwear, you’re covered 24/7/365.

Knix Underwear FAQs

What is the End-of-Year Sale offer?
Our End-of-Year Sale is offering 15% off sitewide. This offer is also available online and in-store while supplies and quantities last.

Are there any exclusions? 
Life After Birth book, gift cards, pre-discounted period kits, Last Call items.

When I add an item to my cart, it is put on hold for me? 
No, items are not reserved for you until your payment is processed and your confirmation number is received. We recommend shopping early (and having your sizing ready) in order to avoid disappointment.

What payment method options are available?
You’re able to use a variety of payments, including credit card, Knix gift cards, PayPal, AfterPay (USA), Sezzle (CAN) and accelerated checkout options. Will you be restocking throughout the sale? Our sale is first come, first served. We will not be restocking through the sale, so be sure to act fast to get the styles and sizes you’re hoping for since stock is limited.

Can I use my discount code or referral code on my sale purchase?
Yes, you may use a discount code or referral code on your purchase. 

Can I collect and earn Top Drawer Rewards points on my sale purchase? 
Yes, purchases on knix.com and knix.ca are eligible to earn and redeem Top Drawer Rewards points.  

Can I pay for my purchase using a Knix gift card?
Yes, you will be able to apply a Knix gift card towards your sale purchase. 

Can I change or cancel my order?
Once an order is placed, we cannot guarantee any address changes, order changes or cancellations. If you would like to change your order, please email info@knix.com as soon as possible.

Standard USA shipping is free on eligible orders over $75USD*.
Orders under $75USD* are $7-8USD depending on location for standard USA shipping.
Standard International shipping is free on eligible orders over $150USD*.
Orders under $150USD* are $20USD depending on location for standard shipping.

*After discounts, before shipping and taxes. Digital gift cards do not count towards the free shipping threshold.

Can I shop the End of Year Sale if I live outside the US and Canada?
 Yes, you can participate in the sale if you live outside of the US and Canada. Please shop on knix.com for international shipping destinations.

How long will it take before my order is shipped? 
Due to a high volume of orders, it can take up to 10 business days for your items to be processed and shipped.

What is the return policy? 
Items with less than a 20% discount or purchases made using discount codes are eligible for a refund or exchange. Items purchased during sale events or from our “Last Call” section with a 20% of more discount may be exchanged for another item or store credit only.  

My purchase feels too snug, what can I do? 
All of our products are designed to fit snug at first and then relax with wash and wear. So please give them time to adjust. For example, if your bra is feeling too tight in the band, you can also purchase a band extender to help give you some extra room while it relaxes to your shape. 

Do sale purchases fall into your Holiday Return policy?
 Purchases made during the End of Year sale are eligible for our Holiday Return policy

You are sold out of what I wanted to buy, can I get a raincheck?
 I am sorry to hear that we sold out of the item you were looking for. We are not offering rainchecks and will not be restocking during the sale period. 

I bought a bra two days ago. Can you price match my last order? 
We are unable to price match orders placed before the beginning of the sale period.



Is a wash bag included in my order? 
Yes, one wash bag will be included with all orders placed during the sale.


Super Absorbency
A total replacement for disposable period products - absorbs approximately 8 tsp, 40 ml, or the equivalent of 8 regular tampons worth of liquid.

High Absorbency
Ready to stop leaks whenever - absorbs approximately 4-6 tsp, 20-30 ml, or the equivalent of 4-6 tampons worth of liquid.

Medium Absorbency
Confident backup protection for heaviest days - absorbs approximately 3 tsp, 15 ml, or the equivalent of 2 tampons worth of liquid.

Light Absorbency
Protection for your lighter days - absorbs approximately 1 tsp, 5 ml, or the equivalent of 1 tampons worth of liquid.

Our Leakproof Period Underwear feature barely-there built-in panty liners that can absorb between 1 and 8 tampons worth of liquid, providing you with confident protection against period leaks, light bladder leaks, and sweat.

Our Essential Underwear feature a moisture-wicking breathable gusset that keeps sweat and odor away, but they do not provide any leakproof protection.

If you want help finding the perfect Leakproof period underwear product size for you, connect with one of our expert Knix team members for a 1-on-1 fitting session over video chat. Book a time that’s convenient for you, and we’ll walk you through everything!

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All of our Underwear bottoms (including Leakproof period underwear) are final sale and not eligible for refund or exchange. 


For hygiene reasons, underwear cannot be accepted. If you have any questions about your new underwear, our team would be happy to help you at info@knix.com