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Catalyst Sports Bra
High Support
Catalyst Sports Bra
$78.00
USD
Buy 2 Bras Get 15% Off
Our most supportive sports bra
Eliminates bounce by 76%
Ventilation for increased airflow
Full coverage design
Size and Fit Guide
Use Our Calculator to Find Your Traditional Bra Size
Step 12 of 2
Your Results
Measure Your Under Bust
Measure Your Full Bust
Wearing an unpadded bra, wrap a measuring tape around the top of your ribcage. You’re looking for a snug fit - so we recommend tightening on the exhale and noting the smallest measurement to the decimal.
Wrap the measuring tape around the fullest part of your chest, making sure the measuring tape is paralell to the floor. Relax your shoulders and measure where it falls.
At Knix, your size is
Still have questions? Ask our virtual assistant about finding the perfect fit.
Still have questions? Reach out to info@knix.com to learn more about our sizing.
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Catalyst Sports Bra
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Catalyst Sports Bra
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Product Description
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
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Comparison Chart
Catalyst Sports Bra
Maximum support
Clasp back closure
Reduces bounce by 76%
Restore Sports Bra
Light support
Padding-free
Pullover style
Momenta Racerback Sports Bra
Medium support
Mesh underband for ventilation
Bra top with sewn-in padding
Longevity Sports Bra
Light support
Bra top with bonded-in cups
Pullover style
HIGH IMPACT SPORTS BRA
High Impact Support
Reduces Breast Movement
Tri Flo Ventilation
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Recently Viewed
What our customers are saying
Generated by AI from 100 most recent customer reviews
Last updated 5 months ago
Customers say this sports bra provides excellent support and comfort for larger busts, with many wearing it all day. The wide straps and molded cups offer secure hold during high-impact activities like running and weightlifting. Many reviews mention the soft, breathable fabric and flattering fit without underwire. Common feedback includes concerns about sizing changes, with several noting the need to size up from previous versions. Some experience issues with strap placement and adjustment, particularly with newer models where straps may loosen or slip. While most praise the durability and long-term wear, a few mention quality concerns with adhesive or hardware over time.
90%would recommend this product
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5,343 reviews
- Rated 5 out of 5 stars4 minutes agoVery Comfortable
As someone who had always worn an underwater bra, it is amazing to find a bra with this much support and comfort.
KCKim C.Verified BuyerReviewingCatalyst Sports Bra - Rated 4 out of 5 stars7 hours agoSlider problem
This bra is truly supportive but after few wears, the adjustable sliders don't stay at their place, they’ll keep on falling out.
HHVerified BuyerReviewingCatalyst Sports Bra - Rated 3 out of 5 stars2 days agoGreat, except for straps.
The bra feels amazing initially. I went to a store to find the right fit. However, the adjustable straps slowly (and sometimes not so slowly) let my boobs fall. The catalyst use to have hooks which didn’t move. Now the adjustable strap just moves down and it feels terrible. If the straps actually stayed it would be a great bra.
TDTanya D.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars3 days agoCatalyst sports bra
Comfortable, supportive, smooth, soft material
DBDonna B. B.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars1 week agoTrue to size
For larger bust it is hard to find a supportive bra that doesn't have a wire. This was a tight fit, but fit better after a few wears. Good support and has better separation than most sports bras.
RBRuth B.Verified BuyerReviewingCatalyst Sports Bra - Rated 1 out of 5 stars1 week agoNeeds a change!!
I love my 2 previous Catalyst bras but this new purchase is not the same. For a large size the straps are too short, even extended to the longest length. What is most unsatisfactory is the gap that is created at the underarm. The bra mold has missed it's mark!! The bra does not lay flat against the body but it creates a large gap that is unbecoming. If I keep my arms up, as in the above picture, the bra may lay flat, but who is going to do that!!
This bra runs small with a large cup.
SZSANDRA Z.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars2 weeks agoMy go to bra
This bra provides firm support and the adjustable straps and closure allow for a perfect fit.
MBMaryLou B.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars2 weeks agoPerfect for work!
As a Nurse, I want really good support without being restrictive. This is the perfect combination. I can wear it for my 12 hr shifts (even when they turn into 14 hrs or more) comfortably. No red marks on my shoulders, and no uniboob. Thanks 😊
KHKimberley H.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars2 weeks agoFull support!
Easy to put on and adjust. Not digging in anywhere especially in the sides. Can do jump squats and jumping jacks without worrying. Bench presses and deadlifts are executed a little easier as there is no side spillage or bulges. Ended up buying 4 bras. So worth it!
RJRoxanna J.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars2 weeks agoBest Sports Bra Ever
Believe me when I tell you, you will not regret this purchase! It is the most supportive and comfortable sports bra I have ever worn. I have thrown out all other brands. Knix is all I will ever wear!
JHJessica H.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars2 weeks agoSuper comfy
It fit exactly to size. Comfortable and very supportive. I can work out without bouncing everywhere like in other sports bras! And the no wire is an added bonus.
AMAlisabeth M.Verified BuyerReviewingCatalyst Sports Bra - Rated 5 out of 5 stars2 weeks ago5 Stars
This is a great bra! Love the non-removable cups.
LLoriReviewingCatalyst Sports Bra
