Shop by Style

More Ways to Shop

Need Help Choosing?
Why Knix Leakproof Works

Bras

Need Help Choosing?
Find Your Bra Size

Sale

New Arrivals
NEW Shape & Smooth Bra
Shop by Life Stage
15% off Thigh Saver® Shorts

Your Bag

Your cart is empty

But you're full of potential..
Create an account to join Club Knix and earn points on this order

Suggestions

Top Picks

Revolution V-Neck Bra

$68.00 CAD
10% off Bra & Underwear Sets*

Color: Meadows Limited Edition

+10

Super Leakproof® Dream Boxer™

$48.00 CAD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Lavender Stripe Limited Edition

+1

Leakproof UltraThin No-Show High Rise

$32.00 CAD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Meadows Limited Edition

+5

Uplift Push Up Bra

$78.00 CAD
10% off Bra & Underwear Sets*

Color: Rose Water

+1
Home / Sports Bras / Catalyst Sports Bra - Last Call
Sale

Catalyst Sports Bra - Last Call

$42.50 CAD

$85.00

50% off
Checkmark

Our most supportive sports bra

Checkmark

Eliminates bounce by 76%

Checkmark

Ventilation for increased airflow

Checkmark

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+

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.
Last Call Return Policy

Sale & Last Call

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.
Rewards Members Earn 42 Points

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

- SELF

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

  • • Days you don’t need leak protection. Everyday freshness and moisture wicking.
  • tsp
    0 tsp

Heavy

  • • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
  • 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

  • • Daily freshness. For sweat, discharge, period spotting, or backup protection.
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

  • • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
  • 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

  • • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
  • 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
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 Support

Combines breast encapsulation and compression for maximum impact support.

Explore Best-Sellers

Shop All

Revolution V-Neck Bra

$68.00 CAD
10% off Bra & Underwear Sets*

Color: Black

+10

Super Leakproof® Dream Boxer™

$48.00 CAD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Blue Stripe

+1

WingWoman Contour Bra

$75.00 CAD

Color: Black

+4

Super Leakproof® Dream Short™

$48.00 CAD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Warm Sand

+3

Uplift Push Up Bra

$78.00 CAD
10% off Bra & Underwear Sets*

Color: Rose Water

+1

Leakproof UltraThin No-Show Bikini

$27.00 CAD
Buy 3+ Save 15%, Buy 5+ Save 20%

Color: Warm Sand

+6

Catalyst Sports Bra

$85.00 CAD
10% off Bra & Underwear Sets*

Color: Black

HiTouch™️ High Rise Legging

$90.00 CAD

Color: Twilight Navy

+2
4.5
Rated 4.5 out of 5 stars
Based on 5,821 reviews
Total 5 star reviews: 4.2k Total 4 star reviews: 863 Total 3 star reviews: 313 Total 2 star reviews: 202 Total 1 star reviews: 269
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)
5,821 reviews
  • Rated 5 out of 5 stars
    3 minutes ago
    Happy

    My new sports bra is very comfortable and I would recommend it to others.

    Rita S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    I love this bra!

    It’s comfortable, fits perfectly and has excellent support for large breasts. Thank you Knix!

    Corinne K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    Best Sports Bra!

    I love this sports bra! It does everything I need a sports bra to do. It keeps the girls in place, even when sprinting. It’s comfortable and offers a little shape so no uniboob. It also looks good from the back; the straps are in the right place to hide any back fat. The new blue color is beautiful!

    Danielle H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Best Sports Bra

    Actually comfy and supportive, plus it makes my boobs look good too, what more could you ask for!?

    Neillia B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Best sports bra

    I love the secure fit, cut and coverage of this bra. This is my second catalyst sports bra. I would definitely recommend this style.

    Indira M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Catalyst sports bra

    Not only your company is one of the most amazing companies that I have the pleasure of doing business with. I purchased the Catalyst sports bra , it is the best bra I’ve ever worn. Great product period. I have had mine for 5 years. Great product period. I just ordered it again and I had a couple of issues with and you guys handled it so Amazingly. You have just got a customer for LIFE. 😁. BEST COMPANY EVER…

    Jacqueline S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Love it!

    I wear this sports bra every day and all day. It is comfortable and holds the girls in place with a flattering silhouette

    Jane C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    The best

    I am a fitness trainer and have been wearing these panties for years - comfortable - I can train with confidence-

    Cynthia J.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Love it

    Very Comfortable. My favourite colour.

    Tonica J. G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Everyday best bras

    I have switched to only wearing these bras. Great support, and I have a few older ones for comfy days and newer ones for hard workouts!

    Lindsay L.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Love!!!

    Support support. Fit is amazing. Keeps the girls snug

    Rose-Marie R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Bra trview

    I love this bra. No underwire but holding tho g up really well!

    Nicole B.
    Verified Buyer
    Was this helpful?

Your questions, answered.

Shop by Category

Bras

Leakproof Underwear

Sleep

New Arrivals

Best Sellers

Apparel

Active

Shapewear

Mens

Teen