Wireless Bras

How do I measure for my Knix bra size?

1. Measure your band: Wrap a measuring tape directly below your breasts (at rib cage), parallel to the floor, firmly tightened, take a deep breath, release, and write down that measurement. If the measurement is an odd number, round up to the nearest even number to determine your band size.

Example: Measured 31" - round up to 32". BAND SIZE IS 32.

2. Measure your Full bust: Wearing a non padded bra, wrap the measuring tape across the fullest part of your breasts. Keep the measuring tape parallel to the floor and close to your body to get your measurement.

Example: Full Bust = 35”

3. Determine your cup size: Subtract your initial underband measurement from your full bust measurement to determine your CUP size. Each inch equals a cup size, so 1”=A, 2”=B, 3”=C, 4”=D, 5"= DD

Example: 31" underband - Full bust 35" = 4" difference = D cup.

4. Your Bra size is: 32D / Knix Bra size 4 & Knix Alpha bra size S

What's my Knix bra size?

Sizing can be a bit tricky and Knix sizing might be a bit different than what you’re used to, but we've got you covered! You can check out all of our size charts here or book a Virtual Fitting here

Can you explain Knix wireless bra sizing?

The way that we size our bras at Knix is to allow different body types to fit into one size. The flexible 5 row hook & eye back closure accommodates your personal preference and level of comfort for the underband.

Do you make an underwire bra?

No, all Knix bras are wireless! Wireless bras give you freedom to move and feel your most comfortable and confident self.

Some of your bras are measured 1-8+ and some in XXS-XXXXL+. Do I measure the same for both?

Yes, you do.

Your underband measurement will equal an alpha size.

For example:

XXS =28Band, XS=30Band, S=32Band, M=34Band, L=36Band, XL=38Band, XXL=40Band, XXXL= 42Band

Regular size cups cover = A - DD

Plus sizes cups cover = E - G

How do I find my size for an exchange?

We recommend scheduling a Virtual Fitting with a Knix Expert or consulting with a team member in-store.

I have noticed gaping on the sides of my wireless bra, what do I do?

We find that gaping in the armpit area can mean that the band of the bra is fitting too large. So, we recommend tightening the band of the bra and adjusting the straps so you have a snug but comfortable fit.

Wearing the bra for the first week is also helpful to allow the bra to relax and mould to your natural shape!

Try making sure:

a) The strap is well adjusted and tightened to minimize the side wing gaping.

b) Adjusting and tightening the underband.

What is your most supportive wireless bra? Or “I am fuller chested, what bra would you recommend for me?”

If you are looking for a high impact, full coverage bra, our Catalyst Sports Bra cannot be beat. We recommend checking out the Front Zip style - a customer favorite for comfort and support!

More generally, you will need to determine the end use of the bra, for example:

For a sports bra, we recommend the Catalyst or Front Zip Catalyst.

For your everyday bra, we recommend the Pullover Bra. Or, if you are looking for adjustability, the Evolution Bra, Padded V-Neck Bra or WingWoman Bra.

What are your wire free bras made of?

All Knix bras (with the exception of the Longevity Bra) are made with bonding technology that creates a comfortable seamless fit and surprisingly solid support without using an underwire. Most of our wire free bras are made of a nylon and spandex blend. For the specific fabric content, please refer to the dropdown on the product's page under "Fabric and Care". Any metal hardware on the bra is nylon coated iron.

My new wire free bra feels tight, do I need a new size?

We recommend:

Wear the bra on the last hook & eye to keep it loose.

Schedule a Virtual Fitting to confirm you have the right size.

Wash and wear it - it’s been designed to adapt to your shape.

If the band of the bra is fitting snug, consider trying a band extender!

Where does Knix make their wire free bras?

Knix is committed to ethical sourcing. All of our products are designed in Canada and manufactured in socially and environmentally responsible factories in just outside of Shanghai in China, Seoul in South Korea, and in Northern Italy. Our manufacturing facilities and materials are WRAP, SA 8000, and Oeko-tex approved.

Looking for specifics about the manufacturing of our Leakproof undies? Check out our blog post here!

How do I wash my wire free bra?

Washing your wire free bra shouldn't be complicated, so we designed our products to be super easy to wash and care for. For best results, machine wash on cold with mild detergent, and lay flat to dry. That's it!

I measure a 28 band what bra would you recommend for me?

Our LuxeLift Pullover Bra & Catalyst Front Zip Bras are designed for smaller band sizes!

Still have questions?

Chat with a Knixpert or email us at info@knix.com

Book a one on one Virtual Fitting with a Knix Expert to discuss sizing, fit, and any other products you have questions on.

What is a Virtual Fitting and how will it help me find my bra size?

If you need help with sizing and finding a style that will work for you we encourage you to check in with our virtual fitting team as they are here to help our customers with just that! One of our Knixperts will connect with you via video chat to help you find the perfect fit in any of our items.

They can double check your measurements to figure out your size, show you a bunch of styles that could work well for you, and can answer any of your questions! They also can assist with exchanges/returns and you are more than welcome to keep your camera off if you don't feel comfortable having it on.

If you have any more questions about Virtual Fittings, check out our FAQ here or our main Virtual Fittings page here.

Click here to book a fitting.

Wireless Bra FAQs