--- source_url: "https://www.underarmour.com/en-us/t/playbooks/apparel-gear/sports-bra-buying-guide/" title: "The Ultimate Sports Bra Guide | Under Armour" mirrored_at: 2026-08-06T01:02:00.529Z host: www.underarmour.com cited_in_42a: true mirror_canonical: "https://index.42a.ai/www.underarmour.com/en-us/t/playbooks/apparel-gear/sports-bra-buying-guide/index" --- > **Original source:** https://www.underarmour.com/en-us/t/playbooks/apparel-gear/sports-bra-buying-guide/ 1. [UA Playbooks](https://www.underarmour.com/en-us/t/playbooks/) 2. [Apparel & Gear](https://www.underarmour.com/en-us/t/playbooks/apparel-gear/) 3. The Ultimate Sports Bra Guide ## How to Choose a Sports Bra: The Complete Guide to Fit, Support & Activity  When you’re mid-mile, mid-HIIT, or mid-game, your focus should be on your next move, not on your straps digging in, bounce that won’t quit, or a bra you keep adjusting. If you’ve ever doubled up for more support, cut a run short, or spent half a workout feeling sweaty, soggy, and distracted, you’re not alone.  When a bra isn’t right, it can pull you out of your training with chafing, shifting, discomfort, or distraction. The best sports bra is built to move with you. It’s built for how you train and your sport, so you can feel supported from warm-up to finish. The key is finding the right match for your body. Support isn’t one-size-fits-all, and it can change with your body, your training, and the demands of your sport.  The right sports bra can be the difference between competing at full capacity and holding back. [A study of elite UK female athletes](https://www.tandfonline.com/doi/full/10.1080/15438627.2022.2038162) found that 51% experienced breast pain, and nearly 1 in 3 of those athletes said it negatively affected their performance.  Then there’s the noise. Different support levels, silhouettes, materials, and features. The options are endless, and without the right guidance, it’s tough to know where to start.  That’s where we come in.  This guide breaks it down so you can cut through the clutter, choose the best sports bra for your body, get the support you need, and train with total confidence.  ![](https://underarmour.scene7.com/is/image/Underarmour/SS26_Q1_InfinityBra_Launch_W_ATT_Hero_Clean_3_1) ## The Science Behind the Need for a Sports Bra Your breasts are made of soft tissue—no muscle, no bone. The only thing holding them in place during a workout is a network of delicate connective tissue called [Cooper's ligaments](https://pmc.ncbi.nlm.nih.gov/articles/PMC9047630/). They weren't built for box jumps or sprint intervals, and they weren't designed to absorb the mechanical load of a high-output training session. That’s where your sports bra comes in.  During physical activity, your breasts move in multiple directions simultaneously, up and down, side to side, and front to back. As breast health expert [Dr. Joanna Scurr, Head of Biomechanics Testing Facility at the University of Portsmouth](https://about.underarmour.com/en/stories/2020/01/introducing-ua-s-most-innovative-sports-bra-yet.html), explains: “A lot of people don't notice, but when you’re running or working out, your breasts don't just move up and down, they also move from side to side and in and out.”  A well-fitting sports bra is designed to minimize that movement across all three planes.   ## The Benefits of Wearing a Sports Bra  Sports bras are engineered for movement in a way traditional bras simply aren’t. Here’s what that difference delivers.  - **Support:** Sports bras are designed to minimize breast movement during physical activity—not just up-and-down bounce, but also [lateral and transverse forces that traditional bras don't address](https://pubmed.ncbi.nlm.nih.gov/32027563/). This matters because [vertical bounce](https://about.underarmour.com/en/stories/2020/01/introducing-ua-s-most-innovative-sports-bra-yet.html) is only one part of how the body moves during training. Different activities demand different levels of support.  - **Comfort & Fit:** Look for sports bras constructed from breathable, moisture-wicking fabrics—like [UA’s HeatGear®](https://www.underarmour.com/en-us/t/playbooks/apparel-gear/what-is-heatgear/)—that move sweat away from your skin so you stay dry and focused. Wider straps, supportive underbands, and snug, activity-specific fits work together to reduce irritation and eliminate the need for constant readjustment.   - **Performance:** Unsupported breast movement can throw off your balance and pull focus mid-rep, mid-stride, or mid-set. A well-engineered sports bra keeps everything stable so your energy goes toward performance—not managing your gear.  - **Posture Support:** Supportive straps and a structured underband help distribute weight more evenly across the upper body, which may help reduce postural strain during high-impact or prolonged activity.    ## Types of Sports Bras Not all sports bras are built the same way. Different constructions are engineered to solve a specific support needs and activities.  - **Compression Sports Bras:** Compression bras hold your chest firmly against your body, reducing overall movement. They’re a solid choice for lower-impact activities like yoga, Pilates, and walking—and many compression styles work for medium-impact training as well. They tend to be streamlined, lightweight, and easy to pull on and off.  - **Encapsulation Sports Bras:** Encapsulation bras use individual cups to surround and support each breast separately. This construction is best for high-impact activities like running, jumping, and HIIT, where multi-directional movement demands more targeted, precise support. Many encapsulation styles include wider straps, structured underbands, and a front zipper for a secure fit.  - **Compression-Encapsulation (Hybrid) Sports Bras:** Hybrid bras combine both approaches into a single construction—delivering the firmness of compression alongside the individual-cup support of encapsulation. This is especially effective for athletes who need maximum support during high-impact activity.     ## Matching Your Bra to Your Activity Impact level is one useful way to think about sports bra selection, but it’s not the whole picture. Here’s how the support levels map to different activities and sports.  ### Low-Impact   - Built for yoga, Pilates, walking, and low-intensity movement.  - _What it delivers:_ Look for [low-impact sports bras](https://www.underarmour.com/en-us/c/womens/clothing/bra/low-impact/) with a soft construction, four-way stretch, a relaxed fit, and easy on/off. Engineered ventilation and minimal seaming keep you comfortable without bulk or distraction during longer, slower sessions. Some come with removable pads.   - _Worth knowing:_ Lower support and less coverage make this the wrong choice for high-impact activities or athletes who need more structure.  ### Mid- or Medium-Impact   - Built for activities like cycling, weight training, boxing, and mixed training days.  - _What it delivers:_ A balance of support and range of motion—less compression than a high-impact bra, but more structure than a low-impact style. A strong choice when you’ll move between activity types in the same session.  - _Pro tip:_ [Medium-impact bras](https://www.underarmour.com/en-us/c/womens/clothing/bra/medium-impact/) aren’t designed for sustained, high-impact running or jumping. If your training escalates, so should your support level.  ### High-Impact  - Built for activities like running, court sports, and field sports.  - _What it delivers:_ Maximum bounce reduction and multi-directional support. Wide straps, higher necklines, and firm underbands help keep everything in place during intense movement.   - _Pro tip:_ Look for [high-impact styles](https://www.underarmour.com/en-us/c/womens/clothing/bras/high-impact/) with convertible straps or a front clasp if ease of on/off matters to you.  See our chart below for more details on the differences between low-, medium-, and high-impact sports bras.   ## Sports Bra Impact Level Guide  ****Impact level****  ****Movement & goal****  ****Best for: Sport/Activity****  ****What to look for****  **Low-impact**  Minimal movement; prioritize comfort and flexibility for all-day wear.  Studio: yoga, Pilates/barre, walking, golf, light hiking, recovery/stretching, casual cycling, etc.  Light compression/soft cups; seamless or bonded comfort; pullover styles with breathable cutouts; adjustable straps; soft 4-way stretch; moisture-wicking fabric; optional removable pads.  **Mid-impact**  Moderate movement; balance support with range of motion.  Weight training, cycling, hiking, elliptical, dance, rowing, etc.  Compression or light encapsulation; crossback or open-back options; pullover or back closure; adjustable or convertible straps; moisture-wicking, fast-dry fabric.  **High-impact**  Significant multi-plane movement; maximize containment and bounce control.  Running, HIIT, cross training, volleyball, basketball, soccer/flag football, lacrosse/softball, tennis, competitive pickleball, track & field.  Bras with strategic support, tailored for high-impact activity; structured cups; firm underband; reinforced sides; front-zip or supportive pullover styles for easy on/off; wide, convertible straps; high-elasticity compression; fast-dry fabric; foam-free or structured, unpadded cups.  Bra Support For Your Workout Whatever activity you’re training for, fit is critical. Many women find that getting the right sports bra comes down to more than impact level. The construction, the support type, and how the bra moves with your body all play a role. The right bra is the one engineered for how you move.  ## How to Measure Yourself For a Sports Bra Before you settle on the perfect sports bra, lock in the one thing everything else depends on: [your measurements](https://www.underarmour.com/en-us/t/size-guide/womens-bras/). Grab a tape measure and follow these directions:   - Band Size: Standing straight up with an unpadded bra on, measure closely around the chest just under your arms, right above the bust. If your result is a fraction, round to the nearest whole number. (ex. 33.7” rounded to the nearest whole number, your band measurement is 34”).  - Bust Size: While wearing an unpadded bra, loosely measure around the fullest part of your bust. Round to the nearest whole number. (ex. 34.5” rounded up to the nearest whole number, your bust size is 35”).  - Cup Size: Subtract your final Band size from your final Bust size to find your Cup Size. (1” difference = A Cup, 2” B Cup, 3” C Cup, 4” D Cup, 5” DD Cup, 6” DDD Cup). See the chart below.   ****Difference****  ****Size****  1 inch  A  2 inches  B  3 inches  C  4 inches  D  5 inches  DD  6 inches  DDD  ## Sports Bra Size Chart **Cup**  **Band(in)**                30  32  34  36  38  40  42  44    AA  XXS  XS  S            A  XS  XS  S  M          B  XS  XS  S  M  L        C    S  M  L  L  XL  XXL    D    S  M  L  XL  XXL  1X    DD    M  L  XL  XXL  1X  2X  3X  DDD      L  XL  XXL  1X  2X  3X  _Note: You can also consult our [Sports Bra Sizing Chart](https://www.underarmour.com/en-us/t/size-guide/womens-bras/)._  ## How to Tell if Your Sports Bra Fits A great sports bra feels locked in from the first wear—secure and supportive, without feeling restrictive. You should be able to inhale fully and move freely. The cups should contain you with no spillage or gaps.  That fit matters more than most people realize: In a 2019 survey Dr. Scurr conducted alongside the English Institute of Sport (EIS), 75 percent of 70 elite athletes in the study had [never been fitted for a sports bra](https://www.eis2win.co.uk/article/innovative-sports-bras-aim-to-boost-health-and-performance/)—and 26 percent said breast pain impacted their performance.  If you notice bouncing when you run, jump, or cut side to side, start with the underband. That band is the engine of your support—it anchors the bra to your ribcage and keeps everything stable. If it’s too loose, the bra can’t do its job, no matter how tight you crank the straps.  Quick fit check: you shouldn’t be able to pull the underband more than about [5 centimeters away from your body](https://www.iheart.com/podcast/1119-ua-sweat-the-details-82512954/episode/science-of-the-sports-bra-with-dr-joanna-wakefield-scurr-84485127). It should sit level all the way around and feel firm—but not dig in—so you can move and breathe comfortably.  Support should be consistent everywhere: band, cups, and straps. If breast tissue spills out at the top or sides, you need a different size or a different style—because overflow usually means less stability and more distraction when you’re pushing pace or competing.  One more fit check: the center front (center panel) should sit flat against your chest. If it floats, it usually means the size is off (band too big and/or cups too small), or the bra’s shape doesn’t match your anatomy. If that’s the case, look for styles with a wider center panel that sits closer and feels more secure.  Your straps should feel secure and comfortable, but they shouldn’t be doing the heavy lifting. If you’re constantly tightening or readjusting, that’s a signal the fit (usually the band) isn’t anchored enough. The band around your ribcage should provide most of the support.  And remember: bodies aren’t perfectly symmetrical. According to Dr. Scurr, “[97% of women](https://open.spotify.com/episode/2nBDGJ0UOsQ1RsS3AlvR4w) have one breast bigger than the other.” So, it’s normal if your straps don’t land at identical lengths—adjusting them slightly differently can help you dial in a more balanced, stay-put fit.  Finally, test it like you train. Jump, reach overhead, jog in place. The bra should keep you supported without limiting your range of motion. If the band rides up or the bra shifts, it’s likely too big. And if you have to over-tighten the straps to feel secure, the band isn’t doing enough of the work.  ## Checklist: How to Choose the Right Sports Bra  Finding the right sports bra is personal—your sport, your body, your comfort. Use this checklist to narrow your options and spot the details that matter most, so you can get the support you need and focus on your training (not your bra).  - **Match Your Bra to Your Activity.** Your sport defines your support. Low-impact activities like yoga or Pilates require lighter support and more flexibility. Medium-impact activities like strength training or cycling require moderate support to stabilize movement. High-impact activities like running, HIIT, or court sports require maximum support to reduce movement and keep you locked in.  - **Lock In Your Fit.** If the fit is off, performance is off. Measure your band and bust, and always check the brand’s size chart before buying. Your sports bra should feel snug and secure, especially for high-impact training, without restricting your breathing or causing discomfort.  - **Choose the Right Support System.** Compression styles hug you close for a streamlined, stay-put feel—great for lower-impact training and athletes who want light, simple support. Encapsulation bras support each breast separately and are built for high-impact sessions where control matters most. Hybrid designs combine both for maximum support when you’re pushing intensity.  - **Prioritize Performance Features.** Look for adjustable straps to customize fit, sweat-wicking fabrics to keep you dry, and a secure underband to anchor support. Features like molded padding, breathable construction, and lightweight materials should all serve a purpose—helping you move better and stay focused.  - **Test for Movement Control.** Your sports bra should reduce bounce and eliminate distractions. When trying it on, move the way you train—jump, reach, sprint in place. The bra should feel secure and stable without restricting your range of motion.  - **Prioritize Comfort Without Compromise.** Avoid straps that dig in, bands that ride up, or seams that cause chafing. The right sports bra distributes pressure evenly across your body, feels secure, and allows you to focus on your workout—not your gear.  - **Reassess and Replace as Needed.** Sports bras can lose elasticity over time with wear and washing, which may impact support and fit. Reassess regularly, especially if your training or body changes. As a general guideline, you may consider replacing your sports bra every 6–12 months depending on how often you wear it, to help maintain consistent performance and support.  The right sports bra is the one that supports _your_ movement. Start with your measurements, choose support that matches your activity, then do a quick fit check—band, cups, straps, and center front—so you feel secure and comfortable from warm-up to cool-down. When your bra fits well, you can focus on showing up and doing your work—confident, supported, and ready for whatever’s next.  ## Frequently Asked Questions  **Q: How often should I replace my sports bra?** A: In general, you should replace your sports bra every six to twelve months, depending on how often you wear it, how vigorously you move, and how well you care for it. If its straps or bands seem stretched out or if it’s not as supportive as it used to be, it’s time to get a new one. It’s also important to replace a sports bra if your body size significantly changes (for example, due to pregnancy).  **Q: How do I know if my sports bra fits correctly?** A: Start with the band. It should feel firm and sit level all the way around your ribcage. A quick test: you shouldn't be able to pull it more than about 5 centimeters away from your body. If it rides up or shifts during movement, it's likely too loose. The cups should hold you fully in place with no spillage at the top or sides and no gapping or wrinkling in the fabric. The center panel should sit flat against your chest—if it floats, the band may be too big or the cups too small.  Straps should feel secure and comfortable, but they shouldn't be doing most of the work. If you're constantly readjusting them, the band isn't anchored enough. Finally, test it the way you train. Jump, reach overhead, jog in place. The bra should keep you supported without limiting your range of motion. If anything shifts, bounces excessively, or digs in, it's time to try a different size or style.  **Q: Does a sports bra flatten breasts?** A: No. A properly fitted sports bra should keep your breasts in place without flattening them. While some sports bras may compress the breasts slightly, they still allow for a natural and comfortable shape.   **Q: Can I machine-wash my sports bra?** A: Make sure to reach and follow the care instructions on your sports bra. With most, you can wash your sports bra in the washing machine with like colors, but it's best to use a lingerie bag or wash it on a delicate cycle to protect the fabric and extend the life of the bra. Use cold water, and avoid fabric softeners or bleach, as they can damage the fabric and reduce its moisture-wicking properties. Avoid ironing, dry cleaning, and hang to dry.  **Q: What impact level sports bra do I need for my activity?** A: Low-impact sports bras are built for gentle activities like yoga, Pilates, or walking where there's minimal movement. Medium-impact sports bras are designed to offer more support for activities like cycling, weight training, hiking, skiing, or dance classes where there’s moderate movement. [High-impact sports bras](https://www.underarmour.com/en-us/t/playbooks/apparel-gear/choosing-the-best-high-impact-sports-bra/) are essential for things like running, jumping, or HIIT workouts.  **Q: Can I wear a regular bra to work out?** A: Regular bras aren’t specifically designed for exercise movement and their stiffer design and underwire may lead to discomfort.  Written By: Heather Darcy  _Heather Darcy is a published poet who somehow ended up obsessed with search algorithms—and she's totally fine with that. As Under Armour's SEO Content Lead, she brings 10+ years of SEO experience alongside a publishing career that's taken her from copy editor to managing editor of an award-winning tech magazine to content strategy and SEO/AEO. She holds a Creative Writing degree from Emerson College, practices yoga, has a serious organic garden, two kids, and one dog who runs the show at home._