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| Black
Light Leakproof No-Show Bikini
$25.00 CAD

Color: Black
Best Seller

Color: Black

Size:

Size:

Size and Fit Guide

Mix & Match: 3+ for $20 each
Rewards Members Earn 0 Points

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Home / Bras / Catalyst Sports Bra
Joanna's Pick

Catalyst Sports Bra

$72.25 CAD

$85.00

15-30% off
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Our most supportive sports bra

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Eliminates bounce by 76%

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Ventilation for increased airflow

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Full coverage design

| Black
| Black
Sofia is 32D and wears a Knix size S+ | Black

Sofia is 32D and wears a Knix size S+

| General
Ventilation in the front helps you stay cool | Black

Ventilation in the front helps you stay cool

Sofia is 32D and wears a Knix size S+ | Black

Sofia is 32D and wears a Knix size S+

Sofia is 32D and wears a Knix size S+ | Black

Sofia is 32D and wears a Knix size S+

Sofia is 32D and wears a Knix size S+ | Black

Sofia is 32D and wears a Knix size S+

| General

Color: Black

Size:

True to Size

•

Size:

Size and Fit Guide

Free Shipping on orders $100+

Shipping

Shipping
Processing Timelines

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* CAD = Free Shipping (2-6 business days)
Orders under $100* CAD = $12 CAD Shipping (1-3 business days)
Orders delivering to NWT, Nunavut and Yukon are subject to $20 delivery fee.*After discounts, before shipping and taxes.
Easy Returns within 30 Days

Returns

Returns
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.

Sale & Last Call

Items discounted below 30% are eligible for size exchange or store credit. Items discounted 30% and above are final sale – no refunds, store credits, or exchanges can be accommodated.
Rewards Members Earn 72 Points

"It’s the only sports bra for bigger boobs I've tried that keeps bounce to a minimum when running."

- SELF

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High Impact Support

You are in control of your performance with our most supportive, full-coverage sports bra.

Feels Made For You

The traditional adjustable hook and eye back closure, featuring five rows, allows you to find the perfect fit easily.

Functional Style

The breathable, moisture-wicking fabric and ventilation in the front help you stay cool throughout your workout. Made with encapsulated cups for maximum support and a locked-in feel, this bra reduces overall breast movement by 76%*.

*During treadmill running; based on the University of Portsmouth Research Group in Breast Health study, 2018.

Zoom

| Black
| Black
Sofia is 32D and wears a Knix size S+ | Black
| General
Ventilation in the front helps you stay cool | Black
Sofia is 32D and wears a Knix size S+ | Black
Sofia is 32D and wears a Knix size S+ | Black
Sofia is 32D and wears a Knix size S+ | Black
| General

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
    6-11 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 3-6 super tampons
  • cup
    about 1-2 menstrual cups

Light

Drop
Drop
Drop
Drop
Drop
  • • light period days
  • • sweat
  • • sweat and 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 3-6 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-3 super tampons
  • cup
    about 0.5-1 menstrual cups

Ultra

Drop
Drop
Drop
Drop
Drop
  • • extra heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    13-17 tsp
  • pad
    3.5-4.5 regular pads
  • tampon
    7-9 super tampons
  • cup
    2-3 menstrual cups
HIGH IMPACT SPORTS BRA

Elevate your performance. Engineered for movement.

The encapsulated cups provide maximum support for a locked-in feel that reduces overall breast movement by 76%*.

High Impact Bra

High Impact Support

Combines breast encapsulation and compression for maximum impact support.

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4.0
Rated 4.0 out of 5 stars
Based on 147 reviews
Total 5 star reviews: 83 Total 4 star reviews: 25 Total 3 star reviews: 11 Total 2 star reviews: 16 Total 1 star reviews: 12
73%would recommend these products
ComfortRated 4.1 on a scale of 1 to 5
FitRated -0.3 on a scale of minus 2 to 2
SupportRated 4.3 on a scale of 1 to 5
Write a Review (Opens in a new window)
147 reviews
  • Rated 5 out of 5 stars
    2 weeks ago
    5 Stars

    So far great, holds very well and super comfortable!

    Carolina
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 weeks ago
    Tightb

    I bought the XL in Catalyst with the zipper and it fits great. Bought this in XXL and it is way too tight. Doesn’t make sense but back it goes.

    Christine
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    5 Stars

    Amazing quality & conforms to your body. It’s my fav bra EVER. Nothing has ever come close to perfect like this bra. I will continue to buy it for yrs to come.

    Katheryn
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    2 weeks ago
    Almost Absolutely Perfect

    For reference, I’m 5’9”, 180lbs, 36DD/38D in other brand bras. I was hoping to find a minimizer bra, but reviews in Knox led me to the Catalyst Sports Bra, for everyday wear. I followed the Size Guide and ordered an XL: the band and the overall fit was much too small, so I exchanged it for an XL+. Pros: wide, comfortable, adjustable straps; very little padding and no uni-boob; maximum support; band doesn’t roll up at all, and there are 5 hook settings. The one and only “Con” I have is the lack of side support, and it could just be a fit issue for me. Overall, the best bra I’ve found for everyday wear—and I’ve been looking for a really long time!

    Pier M.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    3 weeks ago
    Great support

    This bra is great for larger chested women who do high impact activities. It keeps the girls in place! There are two things I would change. One would be to make the shoulder straps longer. I have them at the maximum length and they are still snug over the shoulder. The second would be to make the straps convertible, so you can have them cross at the back to wear under racer-back tanks.

    Colleen Z.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    3 weeks ago
    4 Stars

    Really comfortable

    CINTHIA
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    3 weeks ago
    Catalyst Sports Bra

    I've been in contact with Knix and have shared my thoughts. Not the same as previous beloved Catalyst bras in construction compared to my other ones.

    Shelley W.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Le choix parfait

    Le seul modèle que je porte depuis des années pour le sport!

    Claudia M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    5 Stars

    Very comfortable and supportive.

    Devon
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Amazing support

    This is the only sports bra I buy. Please never get rid of it!

    Katie Z.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Catalyst Sports Bra

    Provides great support for tough workouts while being comfortable enough for everyday use.

    Tracey H.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    3 weeks ago
    Catalyst sports bra

    Very comfortable and good support. Looking forward to more colours!

    Colette M.
    Verified Buyer
    Was this helpful?