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Home / Bras / Catalyst Sports Bra
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Catalyst Sports Bra

$59.50 CAD

$85.00

10% off Bra & Underwear Sets*
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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

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

Sofia is 32D and wears a Knix size S+

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

Sofia is 32D and wears a Knix size S+

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

Ventilation in the front helps you stay cool

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

Sofia is 32D and wears a Knix size S+

| General

Sofia is 32D and wears a Knix size S+

Color: Olive Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Free Shipping on orders $100+

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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

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Returns
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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 59 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

Sofia is 32D and wears a Knix size S+ | Olive
| Olive
Sofia is 32D and wears a Knix size S+ | Olive
| General
Ventilation in the front helps you stay cool | Olive
Sofia is 32D and wears a Knix size S+ | Olive
| 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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4.5
Rated 4.5 out of 5 stars
Based on 5,164 reviews
Total 5 star reviews: 3.7k Total 4 star reviews: 782 Total 3 star reviews: 264 Total 2 star reviews: 165 Total 1 star reviews: 221
90%would recommend these products
ComfortRated 4.5 on a scale of 1 to 5
FitRated -0.3 on a scale of minus 2 to 2
SupportRated 4.6 on a scale of 1 to 5
Write a Review (Opens in a new window)
5,164 reviews
  • Rated 2 out of 5 stars
    3 minutes ago
    Small cup

    The cup size is much smaller than I was expecting. Bra fits great other than that.

    Sarah M.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    8 hours ago
    Short straps

    The straps are too short and bra rides up the breasts and I have to keep pulling bra down. I wore it twice and it is not comfortable.

    Cindy M.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    19 hours ago
    Sizing chart a bit off and placement of straps make the fabric bunch

    I measured myself according to the sizing chart (L+). When my order arrived, it was a bit too big (I excahnged for a L). I preferred the previous model. The configuration of the straps makes them closer to the neck. Having strong shoulders, the fabric at the base of the armpits bunches because the strap at the ton of the shoulder arrives on the inclined part of the shoulder and they tend to slip. The placement of the strap is odd, I never had this problem with other models. I will not buy again. Other models fit better.

    Stephanie G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    23 hours ago
    Great support

    Best support so far, and easy to put on and wear

    Judith K.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    Yesterday
    Good support

    The material is soft and feels good against my skin. The straps however buckle where they attach to the cups. I would prefer that the straps cross over in the back.

    Ruth O.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 days ago
    The straps slide down/dont stay in place

    This is maybe my 6th catalyst bra from Knix because I loved them. They recently changed the straps from the ladder/hook strap to the slider strap and the sliders do not stay put. Why did they change it 😫 they gave me a gift card to buy something else but really I’d just love if they could go back to the ladder straps. 🙏

    Jhanna W.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 week ago
    4 Stars

    The fit is nice and comfortable. I was gifted this model in white a couple of years ago, and I preferred the scraps on the order model.

    Ann
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Too Small

    Still too small, even after I returned the last one & ordered the next size up.

    Nanci L.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Perfect Sports Bra

    Have been wearing the catalyst for years as my regular bra. Its so supportive and comfortable!

    Barbara H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Fits perfect.

    Very comfortable and fits perfect. Doesn't let you bounce!

    Kandiace P.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    2 weeks ago
    vraiment très mal fait pour les fortes pointrines

    J'ai suivi le guide des tailles donc logiquement, je fais du XXL.

    Et bien, c'est très sérré, mes seins sont compréssés et les bretelles bien trop petites.

    Je suis très déçue d'autant que c'est non retournable.

    julie F.
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Love this sports bra!

    Excellent sports bra for tennis!

    Love how you’ve changed the straps so they don’t come undone during a match!

    No more asking my mate to fix it on court or running to the loo to fix it myself! lol

    Shirley B.
    Verified Buyer
    Was this helpful?