The Best Sports Bras for DD breasts

January 03, 2019
Katherine Flemming

Stop torturing yourself already. And stop binding your breasts—that's not helping anyone. Are you doubling up your bras? 

The best sports bra for DD breasts, or G cups or even A cups—because guess what, ALL sizes of breasts require support, ALL sizes of breasts can be damaged if they're not supported correctly—is the Knix Catalyst bra. 

Maybe you love to run but can't maintain the distance anymore because it's painful. Or you love a good HIIT workout but you find that the jump squats or the jumping jacks are causing breast discomfort. And we don't blame you; that kind of discomfort is really awful, and it's doing permanent damage. Once the connective tissue of the breast is stretched, it doesn't bounce back like an elastic—it's gone for good. This type of pain can limit you from excelling at your favourite sport, or crushing your fitness goals. And getting to those places is already a trying feat; your sports bra should be the last thing standing in the way of achieving greatness.

Sports bras support your breast in two ways: constriction and encapsulation. Traditionally, they handle one task or the other—so you're either held in or your held down. But the Knix Catalyst Bra is different because it does BOTH at the same time, while keeping breast separate (so, no flattened uniboob). That's why it's the best high impact sports bra for DD cups.

"As a large chested woman myself, I have struggled to find a high impact sports bra that works," says Joanna Griffiths, the CEO of Knix. "The Catalyst is great because it reduces movement by over 76% (more than any other sports bra on the market) and yet is so comfortable you forget you have it on! This sports bra is the perfect balance of encapsulation (aka no uniboob) and compression to provide women up to a G cup with the support that they need."

The Catalyst is the best high impact sports bra for DD cups, and works for any workout, whether it's a high-impact workout, a lightweight jog, a pilates class, a Tracy Anderson or LekFit-inspired bounce-a long. It's so comfortable, you won't feel like you're bound or held back. What else? During her recent comedy special on Netflix, Ellen recently talked about removing sports bras is so difficult, that she just doesn't remove them. She joked that she was wearing more than eight under her outfit. Not the Catalyst! This one requires less effort to remove (thanks to the ergonomic design) as it takes to wave at somebody. Seriously!

You heard it from Joanna—but why not try for yourself, too?

Catalyst Sports Bra

Our most supportive sports bra ever. And one that doesn’t give you the dreaded uni-boob. Keeping you in place while you move, this bra reduces overall breast movement by 76% (During treadmill running; based on University of Portsmouth Research Group in Breast Health study, 2018).

Catalyst Benefits

Performance Molded Cups
Supportive, breathable design separates and encapsulates your breasts, dramatically reducing movement by 76%.
Tri-Flow™ Ventilation
Increased airflow where your body gets its hottest – right between your breasts.
Easy Adjustability
Straps featuring high-grade plastics, and an adaptable back closure.

See My Size

Need help finding your size? Book a Virtual Fitting

Size 1
Fits 32A, 32B, 34A, 34B

Size 2
Fits 36A

Size 3
Fits 36B, 36C, 36D, 38B

Size 4
Fits 32C, 32D, 34C, 34D

Size 6
Fits 32DD, 34DD, 32E

Size 6+
Fits 34E, 32F, 34F

Size 7
Fits 36DD, 38DD, 36E

Size 7+
Fits 38E, 36F, 38F

Size 8
Fits 40D, 42D, 40DD, 42DD, 40E

Size 8+
Fits 42E, 40F, 42F

Catalyst Bra FAQs

No, the straps are ‘fixed’ and feature adjustable ladder straps for length flexibility.

Absolutely. We have many customers who prefer the high level of support that the Catalyst and Front Zip Catalyst provide for their day to day.