Most of the support for sports bras comes from the band, so a snug band that anchors to the body and doesn’t ride up is the key to support, according to Laura Burke, Intimate Apparel Stylist at Fit X Burke. “If you reach around your back and can pull out the band more than an inch, then you need a firmer band,” she says. “Also, make sure all the breast tissue is in the cup, and you are not relying on super tightened straps for lift.”  Look for sports bras in traditional bra sizing (not small, medium, or large) for a more custom fit. The right sports bra should feel supportive and compressive, but you should still be able to breathe and move around comfortably. Your breasts shouldn’t spill out over the cups or the top of the band, and the band shouldn’t ride up in the back.