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A correctly fitted sports bra sits flat against your sternum, the band stays horizontal across your back, and no breast tissue spills over the cup edges. The band should feel snug. About 80% of the support comes from the band, not the straps. If the straps are doing the lifting, the band is too loose.

Take two measurements with a soft tape, wearing a non-padded bra. First, measure your underband: snug, level, directly under the bust. Round that number up to the next even number for your band size. Second, measure your bust at the fullest point, parallel to the floor at the back. Each inch of difference between the two is one cup size: 1 inch is an A, 2 a B, 3 a C, on through to HH and beyond. The Fit Finder runs the maths for you and matches your size to every MAAREE style.

Five quick checks. The band rides up at the back during a workout. The straps cut into your shoulders. The cups gape, wrinkle or have spillage at the top or under the arms. You're tightening the straps mid-run. Or you can feel bounce on impact. Any one of those means the band, the cup, or the style is off. The Fit Finder fixes most of it in 30 seconds.

For runners and athletes above a D cup, look for a bra that addresses the upward axis, not just compression. MAAREE's Solidarity is sized 28 to 38 back, C to HH cup, and uses adjustable Overband® Technology, the curved panel that controls upward bounce. It won the 2025 Sports Bra of the Year and is worn by Sale Sharks Women, Volleyball England and the Lionesses' Millie Bright.

The band is too loose. The fix is sister sizing: drop one band size and go up one cup. So a 36DD becomes a 34E. The Fit Finder will check this for you.

The cup is one size too generous. Or the band size is too big. It could be either, or both. If you can pull the band away from you easily, try a band size down in your sister size. If gaping happens in only one cup, that's normal: most women have one breast slightly larger than the other. Use the adjustable Overband® to tighten that side more.

The straps are doing the band's job. About 80% of the support should come from the underband. When the band is too loose, the straps end up taking the weight and digging in. Drop a band size with your sister size before anything else. If the straps still cut in with a snug band, look for a wider strap and a shorter shoulder drop, like Solidarity.

Compression bras apply pressure to the chest against the body. Encapsulation bras cup each breast separately. Hybrid sports bras, like MAAREE Solidarity, is a combination of the two, and often provides the high level of impact support.

Sister sizing is the trick fitters use when the band is wrong but the cup volume is right. Going up one band size means going down one cup, and vice versa. So 32E, 34DD and 36D all hold the same amount of breast tissue. They sit differently because the band changes.

Snug, not causing discomfort. A new sports bra band will feel firmer than a regular bra band, especially in the first few wears. You should be able to slide a finger under the band but no more. If you can't get a finger under the band, it's too tight; if you can pull the band from you, it's too loose.