Support: To reduce irritation and chaffing, your bra should limit movement as much as possible. If you choose a compression style and do an activity such as running, look for a model that's at least 25 percent spandex; anything less binding-yet-stretchy will have too much give. For the most support, look for minimal vertical (neck to belly button) stretch in the fabric. However, horizontal stretch is necessary for unrestricted breathing as well as getting the bra on and off.

Fabric: Look for a model that's a blend of 50 percent cotton and "breathable" material such as CoolMax. These materials will keep your skin drier and cooler than cotton alone. They also absorb sweat and minimize odor.

Seams: Seams should be smooth and soft to prevent chafing. Snaps, hooks and zippers should also be well-covered. If the seams of your bra still irritate your skin, try wearing it inside out.

For pregnancy: If you think being pregnant means that you'll never find a good sports bra, you're in for a pleasant surprise. InSport makes a bra that grows as you and your baby grow.

Caring for your bra: To make them last a long time, treat your sports bras like fine lingerie. Wash them in a gentle cycle and in a garment bag so they don't get twisted and pulled in your washing machine. Never put them in the dryer, as that weakens elasticity. If odor is a problem, use an additive with your laundry detergent.