So, how to choose the right sports bra? You have to know what’s out there and understand sports bra sizing. The best-quality sports bras especially sport bras for large breasts and high-impact workouts, typically come in actual bra sizes—rather than simply small, medium, and large. This also means you (or a professional) will need to measure your bra size. Then you can accurately choose the undergarment with the best support for your body and chosen type of exercise.
Compression sports bras do exactly what they sound like: compress breasts to stop them from moving around uncomfortably during exercise. Depending on your breast size, compression sports bras are a comfortable choice and safe bet for medium-impact activities like elliptical workouts, moderate hiking, and cycling.
Encapsulation sports bras surround each breast separately (like your everyday T-shirt bra does), giving you a flattering, natural chest silhouette, but not always as much support as a compression bra. It’s best to save encapsulation bras for low-impact activities such as yoga, walking, and Pilates.
Encapsulation-compression sports bras combine the support powers of both overall compression and individual bra support, making them the ideal choice for women with large breasts, and for high-impact workouts (intense cardio like running, dance workouts, jumping rope, and interval training). If you’re a runner, aim for a high-support bra with padded shoulder straps and either encapsulation or compression technology, Hill-Norton suggests. "Carefully placed seams on the outside of the bra also ensure no unwanted chafing."
Don’t hang on to your favorite bra forever—you need to replace your athletic wear at least twice a year, sports bras included. "A sports bra has an expiration date of around six months because they stretch over time," Hill-Norton says. Once the elastic has worn off and the seams have stretched, you’re back to square one wearing a lack-luster bra. So don’t be afraid to shop for a new one, even if it seems like you just bought it.