Start with fresh measurements, then match them to the brand’s size chart and the support level you need. Sports bra sizing can vary by style (compression vs. encapsulation), so using numbers—not your usual “small/medium/large”—helps you get a secure fit without painful pressure.
Use a soft tape measure and take two key measurements: your underbust (snug, right under the bust) and your fullest bust (around the fullest part). Measure on bare skin or a thin, unpadded bra, keep the tape level, and avoid pulling it too tight. If you’re between sizes, note that detail—sports bras often run firmer than everyday bras.
Don’t rely on your usual bra size alone. Look for a chart that uses your underbust and bust measurements (or a numeric band/cup system). If a chart gives overlapping ranges, pick based on how you prefer your fit: tighter for high-impact running, slightly more forgiving for yoga or walking.
Compression bras (often S/M/L sizing) press tissue closer to the chest and can feel tighter—great for smaller-to-medium busts and many high-impact workouts. Encapsulation bras (often band/cup sizing) separate and support each breast, which can feel more precise and is often a better choice for larger busts or when bounce control is the top priority.
The band should feel snug and stay put when you lift your arms; most support comes from the band, not the straps. Straps should be secure without digging. You shouldn’t spill out at the top or sides, and the fabric shouldn’t wrinkle across the cups. If it feels hard to breathe, causes numbness, or leaves deep marks that linger, size up or try a different style.
For a deeper, step-by-step walkthrough (including sizing tips by impact level), visit the main guide on choosing the right sports bra size online.
It should feel snug and supportive with minimal bounce, but never restrict your breathing. The band stays level, straps don’t dig, and there’s no spilling or gaping.
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