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Bra sizes use two measurement systems depending on the bra type. Traditional bras (underwire, t-shirt bra, balconette) are sized by band size + cup size, expressed as a number and letter combination such as 34B or 36C. Sports bras, bra tops, and athletic bras are most commonly sized by S/M/L/XL labels mapped to a band and cup range, because the stretch construction of sports bra fabric accommodates a range of body measurements at each label. Understanding which sizing system applies to the specific bra style is the first step before ordering.
TLDR: For sports bras and bra tops: measure underbust (band) and bust (cup difference) and match to the S/M/L chart below. A women’s M sports bra typically fits band sizes 34–36 and cup sizes B–C. For traditional bras: band size = underbust measurement rounded to the nearest even number + 4 inches (if odd) or as measured (if even). Cup size = bust minus band size, where each inch equals one cup letter (A=1″, B=2″, C=3″, D=4″).
Both measurements are taken from the body, not from an existing bra. Measure while standing straight, arms relaxed at sides. Use a soft flexible tape measure and keep it horizontal for both measurements.
| Measurement | How to Measure | Used For |
|---|---|---|
| Underbust (Band) | Wrap tape around the ribcage directly under the bust, at the point where the bra band sits. Exhale and keep the tape snug but not tight. Round to the nearest even number. This is your band size. | Traditional bras (determines band size); S/M/L sports bras (determines size range) |
| Bust (Fullest Point) | Wrap tape around the fullest part of the bust, across the nipple line. Keep the tape horizontal. Do not compress the breast tissue. Read the measurement with the tape snug but not tight. | Traditional bras (cup size = bust minus band); S/M/L sports bras (determines cup range) |
Sports bras and bra tops sized by S/M/L use band size and cup size as the underlying input. The table below maps S/M/L labels to the band and cup ranges they accommodate. The specific product in the catalog may have narrower ranges. Always check the individual product’s stated size range before ordering.
| Size Label | Band Size Range | Cup Size Range | Underbust (in) | Bust (in) | Traditional Bra Equiv. |
|---|---|---|---|---|---|
| XS | 28–30 | A–B | 27–30 in | 31–34 in | 28A, 28B, 30A, 30B |
| S | 32–34 | A–B | 31–34 in | 34–37 in | 32A, 32B, 34A, 34B |
| M | 34–36 | B–C | 33–36 in | 36–39 in | 34B, 34C, 36A, 36B, 36C |
| L | 36–38 | C–D | 35–38 in | 38–42 in | 36C, 36D, 38B, 38C, 38D |
| XL | 38–40 | C–D | 37–40 in | 40–44 in | 38C, 38D, 40B, 40C, 40D |
| 2XL | 40–42 | D–DD | 39–42 in | 43–47 in | 40C, 40D, 42B, 42C, 42D |
| 3XL | 42–44 | D–DD | 41–44 in | 45–49 in | 42D, 42DD, 44C, 44D |
| 4XL | 44–46 | DD–DDD | 43–46 in | 47–52 in | 44D, 44DD, 46C, 46D |
Traditional bra sizing combines a numeric band size and a letter cup size. The band size is the underbust measurement rounded to the nearest even number. The cup size is determined by the difference between the bust measurement and the band size. The Prestige Medical fitted and comfort sports bras in the catalog use this traditional sizing system, listing band + cup combinations explicitly.
| Bust Minus Band (in) | Cup Size (US) | Cup Size (UK) | Cup Size (EU/FR) | Cup Size (AU) |
|---|---|---|---|---|
| 1 in | A | A | A | A |
| 2 in | B | B | B | B |
| 3 in | C | C | C | C |
| 4 in | D | D | D | D |
| 5 in | DD (E) | DD | E | DD |
| 6 in | DDD (F) | E | F | E |
| 7 in | G | F | G | F |
| 8 in | H | G | H | G |
The Prestige Medical Fitted Sports Bra and Comfort Sports Bra in the catalog use traditional band + cup sizing across three sizes. This is the only catalog product that explicitly lists band + cup combinations by size label.
| Size Label | Band + Cup Combinations | Product |
|---|---|---|
| Small | 32A, 32B, 34A, 34B | Prestige Medical Fitted Sports Bra, Prestige Medical Comfort Sports Bra |
| Medium | 34C, 34D, 36A, 36B | Prestige Medical Fitted Sports Bra, Prestige Medical Comfort Sports Bra |
| Large | 36C, 36D, 38A, 38B, 38C | Prestige Medical Fitted Sports Bra, Prestige Medical Comfort Sports Bra |
Bra band sizes use different numbering conventions between US, UK, EU, French, and Australian markets. The numbers do not represent the same measurement in all markets. A US size 34 band is not the same as a French size 34 band.
| Underbust (in) | US / Canada Band | UK / AU Band | EU / DE Band (cm) | FR / ES / BE Band | IT Band |
|---|---|---|---|---|---|
| 27–28 in | 28 | 28 | 60 | 75 | 0 |
| 29–30 in | 30 | 30 | 65 | 80 | 1 |
| 31–32 in | 32 | 32 | 70 | 85 | 2 |
| 33–34 in | 34 | 34 | 75 | 90 | 3 |
| 35–36 in | 36 | 36 | 80 | 95 | 4 |
| 37–38 in | 38 | 38 | 85 | 100 | 5 |
| 39–40 in | 40 | 40 | 90 | 105 | 6 |
| 41–42 in | 42 | 42 | 95 | 110 | 7 |
The table below maps every sports bra and bra top in the MFG Merch catalog to its sizing system, size range, material, and decoration context.
| Product | Sizing System | Size Range | Fabric Content | Impact Level | Decoration Option |
|---|---|---|---|---|---|
| Ladies’ Vent Bra (Holloway) | S/M/L/XL | S–XL | 90% poly / 10% spandex body; 92% poly / 8% spandex mesh back | Medium | Screen print, heat transfer |
| Holloway Women’s Vent Sports Bra | S/M/L/XL | S–XL | 90% poly / 10% spandex; Dry-Excel moisture management | Medium | Screen print, heat transfer |
| Boxercraft Girls Sports Bra | S/M/L/XL (Youth) | S–XL (girls sizing) | 90% cotton / 10% spandex; 6.5 oz/yd² | Low–Medium | Screen print |
| Boxercraft Girls’ Criss Cross Bra | S/M/L/XL (Youth) | S–XL (girls sizing) | 88% poly / 12% spandex; 6.7 oz | Low–Medium | Screen print |
| TriDri Women’s Medium Impact Sports Bra | S/M/L/XL | S–XL | 90% recycled poly / 10% elastane; 8 oz/yd²; removable padding | Medium | Screen print, heat transfer |
| BELLA + CANVAS Women’s Nylon Spandex Sports Bra | S/M/L/XL/2XL | S–2XL | 90% nylon / 10% spandex; 7.5 oz/yd²; double layered | Medium | Screen print; BlueSign certified dyes |
| Boxercraft Women’s Sweetheart Sports Bra | S/M/L/XL | S–XL | 91% poly / 9% spandex; 6.5 oz/yd²; sweetheart neckline | Low–Medium | Heat-seal label; screen print |
| Boxercraft Women’s Support Your Team Sports Bra | S/M/L/XL | S–XL | 90% cotton / 10% spandex; 6.5 oz/yd²; double-lined front | Low–Medium | Imprintable covered elastic band |
| Boxercraft Support Your Team Bra | S/M/L/XL/2XL | S–2XL | 90% cotton / 10% spandex; 3.39 oz | Low | Imprintable covered elastic band |
| B-Sport Women’s Bra Top (Badger) | S/M/L/XL/2XL | S–2XL | 90% poly / 10% spandex; racerback; double-ply front | Medium | Racerback has room to print; heat-seal logo back |
| Badger Women’s B-Sport Bra Top | S/M/L/XL/2XL | S–2XL | 90% poly / 10% spandex; no padding; Fair Labor Association | Medium | Heat-seal logo; screen print on racerback |
| B-Sport Girls’ Bra Top (Badger) | S/M/L/XL (Youth) | S–XL (girls sizing) | 90% poly / 10% spandex; racerback | Medium | Racerback has room to print |
| Badger Girls’ B-Sport Bra Top | S/M/L/XL (Youth) | S–XL (girls sizing) | 90% poly / 10% spandex; Fair Labor Association | Medium | Heat-seal logo; racerback print |
| Prestige Medical Fitted Sports Bra | Band + Cup (S/M/L) | S: 32–34 A,B; M: 34 C,D / 36 A,B; L: 36 C,D / 38 A,B,C | 64% poly / 29% nylon / 7% spandex; adjustable spaghetti strap; padded insert | Low–Medium | Not specified for decoration |
| Prestige Medical Comfort Sports Bra | Band + Cup (S/M/L) | S: 32–34 A,B; M: 34 C,D / 36 A,B; L: 36 C,D / 38 A,B,C | 92% nylon / 8% spandex; racerback; padded insert | Low–Medium | Not specified for decoration |
| Performance Sports Bra (sublimation) | S/M/L/XL | S–XL | Polyester (moisture-wicking) | Medium | Full sublimation (all-over print) |
| Women Racerback Sports Bras: High Impact | S/M/L/XL/2XL/3XL | S–3XL (wide range) | Moisture-wicking; seamless; hollow-out back; MOQ 1,000 pcs | High | Custom logo available |
| Sports Stretch Wire-Free Bra | S/M/L/XL/2XL/3XL/4XL | S–4XL | 4-way stretch; wireless; SmoothTec technology; MOQ 10,000 pcs sea freight | Low–Medium | Logo available |
Girls’ sports bras (youth sizing) use the same S/M/L labels as adult sports bras but map to significantly smaller body measurements. Girls’ sizing in the catalog covers brands including Boxercraft and Badger. The table below provides body measurement guidance for girls’ sports bra sizing.
| Girls’ Size | Age Range (approx.) | Underbust (in) | Bust (in) | Adult Women’s Equiv. |
|---|---|---|---|---|
| S (Girls’) | 8–10 yr | 23–25 in | 25–28 in | No adult equivalent: girls’ cut only |
| M (Girls’) | 10–12 yr | 25–27 in | 27–30 in | No adult equivalent: girls’ cut only |
| L (Girls’) | 12–14 yr | 27–29 in | 29–32 in | Approaches women’s XS at upper end |
| XL (Girls’) | 14–16 yr | 29–31 in | 31–34 in | Equivalent to women’s XS–S |
Sports bra decoration is more limited than t-shirt decoration because the curved body, stretch fabric, and small surface area constrain the available print zones. The primary decoration zones are the racerback center panel and the front below the neckline. The Badger and Holloway bra tops specifically note that the racerback panel has room to print, making them the best catalog options for prominent back logo placement.
Screen print on the racerback panel works well for simple logos at small scale on polyester and nylon sports bra fabrics. Full sublimation (all-over print on white or light polyester fabric) is available for the Performance Sports Bra and is the most versatile format for all-over team color programs. Heat transfer applies to most polyester sports bra fabrics and works for left chest logo placement where the surface is flat enough to maintain adhesion through repeated washing. Embroidery is not suitable for sports bra fabrics because the thin, stretch fabric cannot support embroidery stitch tension without puckering.
MFG Merch carries sports bras and bra tops across women’s and girls’ sizing from brands including Holloway, Boxercraft, Badger, BELLA + CANVAS, TriDri, and Prestige Medical, along with direct-source performance styles for large-volume programs. For custom sportswear programs that include sports bras as part of a team uniform kit, the bra top and racerback decoration can be coordinated with matching custom leggings and shorts for full-kit consistency.
Ready to build your sports bra program? Start your custom activewear order and the production team will confirm sizing, fabric, decoration placement, and minimum quantities for your program.
Measure your underbust circumference directly below the bust with the tape snug. This determines your band size. Round to the nearest even number. Then measure your bust at the fullest point. Subtract the band measurement from the bust measurement. Each inch of difference corresponds to a cup size (1″ = A, 2″ = B, 3″ = C, 4″ = D). For sports bras sized by S/M/L, match your underbust and bust to the sports bra size chart above rather than the band + cup chart.
A 36C translates to a sports bra size L in most S/M/L sports bra charts. The L size covers band sizes 36–38 and cup sizes C–D. If the sports bra runs on the snug side, size up to XL for more comfort, especially for high-impact activity where a slightly looser fit reduces restriction. If the sports bra runs loose, stay at L. Sports bras provide compression rather than structured support, so a snugger fit is appropriate for most activity levels.
A sports bra is designed primarily for support during physical activity, with compression, moisture-wicking fabric, and minimal decoration surface. A bra top is a hybrid style that functions as both a bra and a cropped top, often with a wider racerback panel that provides room for logo printing. Bra tops from Badger and Holloway in the MFG Merch catalog explicitly note that the racerback has room to print, making them more suitable for branded team programs than compression sports bras where the surface area is limited.
No. Girls’ S/M/L sports bra sizing maps to significantly smaller underbust and bust measurements than women’s S/M/L. A girls’ L fits an underbust of approximately 27–29 inches, while a women’s XS starts at approximately 27–30 inches underbust. At the upper range of girls’ XL (approximately 29–31 inches underbust), there is overlap with women’s XS. Girls who are at the upper end of girls’ XL and who have a developed chest may fit better in women’s XS than girls’ XL, because women’s patterns include more cup shaping relative to the body proportions.
Sublimation printing on sports bras requires a minimum of 92% polyester content for full color vibrancy. The Performance Sports Bra in the MFG Merch catalog is specifically offered with full sublimation as the decoration method, indicating it meets this polyester content requirement. Nylon-spandex sports bras (such as the BELLA + CANVAS nylon/spandex bra) cannot be sublimated because nylon does not accept sublimation dye. Cotton-spandex bras (Boxercraft styles) also cannot be sublimated. For all-over printed team sports bra programs, specify a polyester-dominant fabric and confirm the polyester percentage before ordering.
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