Sports Bra Guide – How to Find Your Perfect Fit
A great sports bra is the single most important piece of gym wear you'll ever buy. Yet so many women are wearing the wrong size, the wrong style or the wrong support level — and it's affecting both their comfort and their performance.
In this complete sports bra guide, we're covering everything you need to know to find your perfect fit — from measuring yourself correctly to choosing the right support level for your workout.
Why Your Sports Bra Matters
During exercise, breast tissue can move significantly — up, down and side to side. Without proper support, this movement can cause discomfort, pain and even long-term damage to the Cooper's ligaments that support breast tissue. A well-fitted sports bra minimises this movement, keeping you comfortable and protected during any workout.
Beyond protection, a great sports bra also boosts your confidence. When everything is secure and supported, you can focus entirely on your workout — not on adjusting your kit.
How to Measure Yourself for a Sports Bra
Getting your size right is the first step to finding your perfect sports bra. Here's how to measure yourself at home:
- Band size — Measure around your ribcage, directly under your bust. Keep the tape measure snug but not tight. Round to the nearest whole number.
- Cup size — Measure around the fullest part of your bust. Subtract your band measurement from this number. Each inch difference corresponds to a cup size (1 inch = A, 2 inches = B, 3 inches = C, etc.)
Remember: sports bra sizing can vary between brands, so always check the specific size guide before buying.
Choosing the Right Support Level
Not all sports bras are created equal. The most important factor when choosing a sports bra is matching the support level to your activity:
Low Impact Support
Best for: yoga, pilates, walking, stretching, barre
Low impact activities involve minimal bounce, so you don't need maximum support. A light, seamless sports bra or crop top with removable pads is perfect. Look for something soft, breathable and flattering that moves with your body.
Our picks: B|Fit LUXE Sports Crop, Women's Fitness Crop Top with Removable Pads
Medium Impact Support
Best for: gym training, cycling, HIIT, dance classes, hiking
Medium impact activities require a more secure fit with a supportive band and moderate cup support. Look for a sports bra with a wide underband, adjustable straps and breathable fabric.
Our picks: B|FIT XCELERATE Sport Bra, NOVA Sports Bra with Removable Padding, B|Fit AURA Sports Bra
High Impact Support
Best for: running, intense cardio, aerobics, jumping
High impact activities require maximum support to minimise bounce and protect breast tissue. Look for encapsulation-style bras with moulded cups, wide straps and a firm underband. Underwire or structured support is often beneficial for larger cup sizes.
Signs Your Sports Bra Doesn't Fit Properly
Even if you've measured yourself, it's important to check the fit when you try a sports bra on. Here are the signs it's not right:
- The band rides up — The band should sit horizontally around your ribcage. If it rides up at the back, go down a band size.
- The straps dig in or fall off — Straps should be snug but not painful. If they're digging in, the band may be too loose. If they fall off, try adjusting or go up a band size.
- Spillage over the cups — If your bust is spilling over the top or sides of the cups, go up a cup size.
- Gaps in the cups — If there's empty space in the cups, go down a cup size.
- Discomfort or pain — A well-fitted sports bra should never cause pain. If it does, try a different size or style.
Sports Bra Styles Explained
Crop Top / Bralette Style
A seamless, pull-on style that's perfect for low impact activities. Comfortable, flattering and easy to wear. Often features removable pads for customisable coverage.
Racerback
A classic sports bra style with straps that meet at the centre back. Great for freedom of movement and keeping straps in place during exercise.
Crossback
Straps that cross at the back for a secure, stylish fit. Great for medium impact activities and looks great under low-back gym tops.
Underwire
Structured support with an underwire for maximum lift and separation. Best for larger cup sizes and high impact activities.
How to Care for Your Sports Bra
A quality sports bra is an investment — look after it and it will last much longer:
- Wash on a cold, gentle cycle after every wear
- Avoid fabric softener — it breaks down elastic and moisture-wicking properties
- Air dry rather than tumble dry — heat damages elastic fibres
- Rotate between multiple sports bras to extend their lifespan
- Replace your sports bra every 6–12 months, or when the elastic starts to lose its stretch
Our Top Sports Bra Picks at B|Fit
Ready to find your perfect sports bra? Here are our most-loved styles:
- B|FIT XCELERATE Sport Bra — High impact support, moisture-wicking & sleek modern design. Our top pick for the gym.
- NOVA Sports Bra with Removable Padding — Versatile, comfortable & customisable. Perfect for medium impact workouts.
- Women's Fitness Crop Top with Removable Pads — Light support, flattering crop style. Ideal for yoga & pilates.
- B|Fit AURA Sports Bra — Seamless, soft & supportive. Available in stunning colourways.
- B|Fit FLOW Sports Bra — Fluid, graceful design perfect for yoga & mindful movement.
Final Thoughts
Finding the perfect sports bra is one of the best investments you can make in your fitness journey. The right fit means more comfort, better performance and the confidence to push harder in every workout.
Once you've found your sports bra, complete your outfit with our guides on How to Build the Perfect Gym Outfit, Best Gym Leggings for Women, and Seamless vs Regular Gym Wear.
Ready to find your perfect sports bra? Shop the full B|Fit Women's collection below.