When it comes to running, your sports bra is just as important as your shoes. So, how should a sports bra fit for running? It starts with accurate measurements, understanding support levels, and recognizing the signs of a perfect (or poor) fit. In this guide, we’ll walk you through how to measure your size correctly, what support level you need, and how to choose a bra that keeps you feeling confident and comfortable with every run.

How to Measure Your Bra Size for Running

Getting the right fit starts with knowing your correct bra size, which can be trickier than it seems. 

Start by measuring your band size

  • Use a soft measuring tape to measure around your ribcage, just under your bust. 
  • Make sure the tape is snug but not too tight. 
  • This measurement, in inches, will give you your band size. 
  • If you get an odd number, round up to the next even number for your band size.

Measure your bust size

  • Wrap the measuring tape around the fullest part of your bust, keeping it parallel to the ground. 
  • Again, ensure the tape is snug but not compressing your breasts. 
  • Subtract your band size from this bust measurement to determine your cup size. 
  • Each inch difference corresponds to a cup size (e.g., a 1-inch difference is an A cup, a 2-inch difference is a B cup, and so on).

It’s also important to remember that different brands may have slight variations in sizing. Always refer to the brand’s specific sizing chart and read reviews to understand how their bras fit. If possible, try on the bra before purchasing or buy from a retailer with a good return policy. Proper measurement is the foundation of finding a bra that will provide the support and comfort you need.

Woman exercising with confidence in her sports bra

Support Levels: Which One is Right for You?

Running bras come in various support levels, typically categorized as low, medium, and high support. The right level for you depends on your breast size and the intensity of your workouts. 

Low support bras are usually suitable for smaller-breasted women and low-impact activities like yoga or walking. They offer minimal structure and are often very comfortable but may not provide enough support for running.

Medium support bras are a middle ground, offering more structure and support than low support bras. They are suitable for medium-impact activities like cycling or hiking, and can sometimes be adequate for running, depending on your breast size. These bras often feature a combination of compression and encapsulation to provide balanced support.

High support bras are designed for high-impact activities like running. They offer maximum support to minimize breast movement and discomfort. These bras typically feature strong bands, wide straps, and encapsulated cups for individual support. For larger-breasted women, high support is crucial to ensure comfort and prevent long-term damage to breast tissue. 

A properly fitting sports bra is essential for any runner. By measuring your size carefully, choosing the right support level, and paying attention to how the bra feels during movement, you can prevent discomfort and ensure your running routine stays enjoyable.

Don’t settle for a “good enough” fit, your body deserves better 

Explore a collection of high-support running bras designed for every shape and stride, and experience the difference the right fit can make on your next run.