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Home / Up to 60% off Bras / FreeFlex™ Demi Bra
Hot Deal 🔥

FreeFlex™ Demi Bra

$54.40 USD

$68.00

2 for $80
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Our first underwire bra

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Comfortable, flexible wire

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Lifts and separates

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Lightly lined molded cups

| Black
| Black
Sofia is wearing a 32D | Black

Sofia is wearing a 32D

| General
| General
| General
| General
Sofia is wearing a 32D | Black

Sofia is wearing a 32D

Color: Black

Size:

True to Size

•

Size:

Knix Size

Size and Fit Guide

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Shipping

HOLIDAY SHIPPING

Give the gift of Knix! To receive your order by Dec 24th, please order by the following dates.

All States - Urban Centers (except Hawaii, Alaska)
Standard: Sunday, December 14
Express: Tuesday, December 17

Alaska, Hawaii & Rural
Standard: Wednesday, December 10
Express: Wednesday, December 10
Express shipping is unavailable for international orders:

Africa, Central/South America, and Caribbean
Standard: Wednesday, December 10

Asia, Australia, and New Zealand 
Standard: Thursday, December 11

Europe and the Middle East 
Standard: Thursday, December 11

United Kingdom, France, Germany, Netherlands, Switzerland, and Japan 
Standard: Monday, December 15

Please note: Weather conditions and carrier issues may cause delays. Delivery dates are not guaranteed.

Processing Time
Please allow 1-2 business days for our warehouse team to pack and ship your order. During peak periods such as sales, holidays and product launches, please allow up to 4 business days for us to process your order.

Delivery Time
For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines vary depending on location and do not include processing times.

Shipping Charges
Orders over $100* USD = Free standard Shipping (4-8 business days)**
Expedited = $4.99 USD (3-6 business days)**

Orders under $100* USD = $7.99 USD Standard Shipping (4-8 days)**
Expedited = $9.99 USD (3-6 business days)**

*After discounts, before shipping and taxes. Processing times not included in estimates.
**Military Addresses Excluded. Standard Military Address Shipping = $10.00 USD (est. varies per location)
Year End Sale Return Policy

Returns

Returns

Sale & Last Call

Items discounted 30% and below are eligible for size exchange or store credit. Items discounted above 30% and above are final sale – no refunds, store credits, or exchanges can be accommodated.

Free Returns

Knix covers the return shipping fees for exchanges and refunds initiated through our Return & Exchange Portal. Exchange orders initiated through our Return & Exchange portal are also eligible for free shipping within the USA and Canada. Please note, the shipping fees on your original order are non-refundable.

Return Policy

Return policy varies by product, please check if your item is refund or exchange eligible by viewing our full policy here.
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The Underwire Bra Reinvented

Wear tested for over 625 hours, providing unparalleled lift, separation, and support.

All Day Comfort

It's everything you want from an underwire bra without the downfalls of one.

Feels Made For You

Lightly lined, moulded demi cups lift and separate for a great shape that looks amazing under lower necklines and T-shirts. Adjustable straps create the perfect fit.

Smooth Coverage

The ultimate t-shirt bra that appears invisible under clothes.

Zoom

| Black
| Black
Sofia is wearing a 32D | Black
| General
| General
| General
| General
Sofia is wearing a 32D | Black

How to Choose?

Essential

Drop
Drop
Drop
Drop
Drop
  • • Everyday Wear
  • • No leakproof protection
  • tsp
    0 tsp

Heavy

Drop
Drop
Drop
Drop
Drop
  • • heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    about 8-14 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 4-7 super tampons
  • cup
    about 1.5-3 menstrual cups

Light

Drop
Drop
Drop
Drop
Drop
  • • light period days
  • • sweat
  • • discharge
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

Drop
Drop
Drop
Drop
Drop
  • • moderate period days
  • • light bladder leaks
  • • sweat
  • tsp
    about 4-8 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-4 super tampons
  • cup
    about 0.5-3 menstrual cups

Ultra

Drop
Drop
Drop
Drop
Drop
  • • extra heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    about 15-20 tsp
  • pad
    about 1.5-2.5 super pads
  • tampon
    about 7-11 super tampons
  • cup
    about 2-3 menstrual cups

How it Compares

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Wireless support

Wireless support

Extra side and back coverage

Extra side and back coverage

Lightly lifts and separates

Lightly lifts and separates

Uplift Push Up Bra
Wireless boost

Wireless boost

Foam panel creates natural lift

Foam panel creates natural lift

All-day comfort

All-day comfort

FreeFlex™ Demi Bra
Comfortable, flexible underwire

Comfortable, flexible underwire

Lightly lined cups

Lightly lined cups

Lifts and separates

Lifts and separates

Revolution V-Neck Bra
#1 Best-selling bra

#1 Best-selling bra

Deep V Neckline

Deep V Neckline

Wireless Support & Lift

Wireless Support & Lift

FREEFLEX™ TECHNOLOGY

Meet our first wired bra reimagined for optimal comfort and support

Wear tested for more than 625 hours to provide unparalleled lift, separation and support.

Molded Cups

Carbonized Flexible Wire

Innovative carbonized wire flexes and moves with you, delivering the classic structure of an underwire without pinching or digging.
NEW! UPLIFT PUSH-UP BRA

A new era of push-up

Unparalleled Lift. Unmatched Comfort. The boost you didn't think was possible from a wireless bra. Until now.

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Revolution Scoop Bra

$52.00 USD
$65.00
20% off

Color: Cheetah Print Limited Edition

The One&Only Scoop Bra®

$29.00 USD
$58.00
Limited Time Offer

Color: Warm Sand

FreeFlex™ Demi Bra

$54.40 USD
$68.00
2 for $80

Color: Black

Revolution Adjustable Pullover Bra

$52.00 USD
$65.00
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Revolution Shadow Mesh Bra

$52.00 USD
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3.9
Rated 3.9 out of 5 stars
Based on 422 reviews
Total 5 star reviews: 217 Total 4 star reviews: 65 Total 3 star reviews: 49 Total 2 star reviews: 48 Total 1 star reviews: 43
69%would recommend this product
ComfortRated 3.9 on a scale of 1 to 5
FitRated -0.1 on a scale of minus 2 to 2
SupportRated 4.1 on a scale of 1 to 5
Write a Review (Opens in a new window)
422 reviews
  • Rated 2 out of 5 stars
    4 days ago
    Imperfect Fit

    I ordered the right size; but there are gaps in the sides of the fabric and the bra makes sounds where the underwire is located. I'm probably going to donate the bra. I ordered a size down and there was no improvement in the fit or sounds the underwire makes.

    DENISE A.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    1 week ago
    Not the Greatest

    I'd say this bra is adequate. It squeaks, like many others have said, and I feel its presence too much on my sides. But it has good shape. Hoping the noise goes away with washing a few times and wearing it in?

    I originally bought my usual size, but it was far too small in the band, so I went by their sizing and it worked.

    Larissa
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Great

    Beige an pd blacj

    Connie C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    So comfy!

    The Knix version of an underwire bra is the most comfortable. I will definitely get more in different colours. My only wish is they come up with this model in a full coverage bra

    Isabelle D.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    1 week ago
    Looks good, sounds funny…

    It’s strange.. whatever is used in the underwire, it squeaks!! Kind of annoying!

    Pamela S.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    1 week ago
    Flex free Demi

    I found the sizing to be a bit off but replaced with the correct size. The fit is nice but the centre area between the cups I find to be quite uncomfortable and really can’t wear it unfortunately.

    Natalie W.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Jk

    Too small

    Jenny K.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    2 weeks ago
    Free flex - Uncomfortable

    Not impressed with this bra. The flex-wire in the front squeaks really loudly with every movement. Also it leaves lines from all the seams on both front and back of my body, even though it’s not too tight. I don’t recommend this one. (Unfortunately I bought two of these, hind sight would’ve bought another “revolution v-neck”.)

    Laurel P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    FreeFlex Demi Bra

    Was not a good fit for me, cups larger than expected.

    Michele D.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Love it!

    Love the fit everywhere, the material and that it doesn’t rub. I am so happy that I saw the Knix store and stopped in. I hate ordering bras online because you don’t know how they will fit and I would have never bought a Knix. The sale clerk did a sizing and I came out with 5 bras and ordered a second Free-Flex online since.

    Jennifer L.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 weeks ago
    3 Stars

    The bra is ok. I like the feel of the fabric- buttery soft- & the cups aren't too padded, which is nice. However, the shoulder straps slide off my shoulders & the adjustment doesn't stay in place. The band is nice & some what comfortable but something near the hooks on the end did into my back. I think it might just be elastic under the fabric or the corner of the fabric with the seam that is hard & digging into my back. Sadly I'm not thrilled with it because it would be a really nice, comfortable bra if not for that. I wanted to return it but it was a clearance item so i am forced to keep, or i can try reselling on another site.

    Anna
    Was this helpful?
  • Rated 3 out of 5 stars
    2 weeks ago
    Squeaks and uncomfortable.

    While this bra has good side coverage and felt okay in store I, unfortunately, find it uncomfortable to wear for more than an hour or so. It’s mainly uncomfortable at the back clasp so I stopped wearing it. I am disappointed after spending so much. I am not sure what the problem is, maybe the nature of the fabric? :-(

    Also, a non-metallic underwire seemed like a good idea but I find it noisy (sort of squeaky).

    Tammy S.
    Verified Buyer
    Was this helpful?