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Home / Up to 60% off Bras / Catalyst Sports Bra
Sale

Catalyst Sports Bra

$62.40 USD

$78.00

20% 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

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

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+

| General

Sofia is 32D and wears a Knix size S+

Color: Black

Size:

True to Size

•

Size:

Size and Fit Guide

Get FREE Express Shipping on all orders $125+

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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"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+ | 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
| 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
    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
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 5,191 reviews
Total 5 star reviews: 3.8k Total 4 star reviews: 784 Total 3 star reviews: 266 Total 2 star reviews: 167 Total 1 star reviews: 224
90%would recommend this product
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)
5,191 reviews
  • Rated 1 out of 5 stars
    4 hours ago
    Short Straps

    it feels good, but the straps are fully open and it feels too tight.. Returning

    M M.
    Verified Reviewer
    Was this helpful?
  • Rated 5 out of 5 stars
    10 hours ago
    Love!

    Amazing fit, comfort, and support! Highly recommend.

    Nadeen A.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    Every Day Perfection

    Great for bigger busts.

    This is my go to bra. I love the fit and versatility.

    I have one in every colour!

    Donna T.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    Catalyst

    Awesome!

    Geetha M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Comfortable breathable support

    I love this sports bra. It gives good coverage and support, is very comfortable, is warm enough when cross country skiing, yet breathable.

    Elizabeth M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Fits well once worn

    Tight to get on initially, but fits well once it moods to you.

    Erica F.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Only thing to keep these 38G bad boys in place in a workout!

    I am 5'5" and 185 pounds. I wear a 38G bra. According to the measurement guide (and I got out a tape measurer and measured myself before ordering), I should be an XL++ . After reading the reviews, I purchased the XXL++ instead. I am so glad I sized up because WOW, there is NO WAY these puppies would be able to cram into anything smaller. My cup over-runneth! The Catalyst Bra is only the 2nd sports bra I've ever had that kept the twins in line. Just to be clear, I order my Knix tanks in XL+, but I order bras in XXL++ and that is *almost* too small for the bras. The molded cups in the Catalyst are NOT removeable like pretty much everything else Knix makes. But this is also not like anything else: the entire bra seems to be molded as a single piece. The mold is a bit pointy and the points are a bit lower than I'd like, like the points don't seem centered to me (at least compared to the natural slope/curve of *my* breasts, but that will be different for everyone), but in the grand scheme of things, if it can mean someone with a G-cup can RUN? I mean take the win, ladies. I noticed that there are 5 rows on the hook&eye closure, which is absolutely critical as the bra stretches out a bit over it's lifetime. I bought a Catalyst about 8 years ago and I wore that till it was just shreds of fabric falling apart. You will need to start putting it on tighter and tighter rows over the years. Also, if you are long between the top of your chest and your shoulders, the adjustable space on…

    Sierra G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    This is a great bra

    Comfortable for all day, every day wear.

    Ingrid P. D.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    3 weeks ago
    Best bra but...

    The new sizing is not working for me. I wish they have kept the old sizing. If you can get it to fit properly this is a great bra.

    Tracey M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Sports bra

    Excellent

    Melanie S.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    Catalyst Sports Bra Review

    Holds me up better than other bras I have tried. I love that it does not have removable pads. One negative is that is does not lay flat on the sides. It sticks out a little. I try to push it down with my shirt. This is the only reason I did not give it 5 stars

    Chris M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Love this sports bra- full coverage!

    This is an excellent sports bra. I love that it comes in a Jude color. I love how it supports and keeps me covered in all types of exercise! I’m a repeat buyer- stronger recommend this bra!

    They changed the sizing from numbers so I’m not sure why I can’t select the size on the review- I’m an xl+

    Alexandra C.
    Verified Buyer
    Was this helpful?