If the underband stays put when you raise your arms, you’re good to go. It should sit level on your ribs with enough room for two fingers underneath. Straps should feel secure and barely-there—no digging or slipping.
02. Check the Band
Make sure the fabric’s got you fully covered without gaping, bulging, or you know, squishing the girls.
03. Test the Support
Do five jumping jacks (or any move you’d normally do in a workout). Too much bounce? Go for a higher-support style, a wider strap or a trusty racerback.
And we don’t want to join the drawer of disappointing bras in your dresser.
That's why we're offering you the "No BS" Brilly guarantee. Take our bra for a 180-day test drive. Wear it, wash it, put it through its paces. Jump, run, lounge, or have a dance party in your kitchen - we don't judge. If it's not the most comfortable, supportive sports bra you've ever worn, send it back for a full refund. No questions asked, no awkward explanations needed. Because we're rebelling against bad bras on behalf of all women.
Brilly isn’t just another sports bra—it’s a complete reinvention of support. While traditional bras rely on outdated design solutions, we engineered the patented Tri-Balance technolgoy that prevents upward movement and adapts to your body, not the other way around.
How do I find my perfect size?
Our bra is designed to adapt, but getting the right size is key. Check out our [size guide] or talk to a fit expert for a personalized recommendation.
Can I wear this all day, not just for workouts?
100%. It’s designed for movement and comfort, so whether you’re crushing a 10k or running errands, Brilly has your back (and front).
What’s the fabric like?
Unlike most high-support bras, we use a woven, four-way stretch fabric that’s lightweight, breathable, and incredibly durable.
What if I’m between sizes?
If you're between sizes, we generally recommend sizing up for more comfort or sizing down for a snugger fit. The adjustable straps and band let you fine-tune your fit.
READY TO BREAK THE RULES WITH US?
When you join our ambassador community, you can get free bras for life.
That's why we're offering you the "No BS" Brilly guarantee. Take our bra for a 180-day test drive. Wear it, wash it, put it through its paces. Jump, run, lounge, or have a dance party in your kitchen - we don't judge. If it's not the most comfortable, supportive sports bra you've ever worn, send it back for a full .
