Wholesale Sports Bras — Three Impact Tiers, 30–42 Band × A–DD Cup Graded In-House
All three impact tiers (low / mid / high) are tooled on our own floor — compression bralettes, combination racerbacks, and encapsulation with molded cups + hook-eye bands. Band 30–42 and cup A–DD grade as two independent axes, with proportional cradle, wing, underband, and strap-anchor regrading per cup volume.
Low impact
Compression bralette · pull-on · removable pads
200–240 GSM
Medium impact
Combination racerback · power-mesh back · molded cup option
220–260 GSM
High impact
Encapsulation · molded cups + hook-eye band + adjustable straps
260–320 GSM
The Custom Sports Bra Manufacturer’s Support System: Three Tiers, Three Constructions
Most factories cut two compression pull-over blocks and outsource anything structured. As a custom sports bra manufacturer we build every support tier in every construction, so your full bra range ships from one floor.
Soft compression bralette, pull-on, removable pads.
Light molded cup, soft band, wire-free shaping.
Compression shell with a light cup for a clean line.
Firm racerback pull-on with power-mesh back.
Shaped molded cups, structured band, defined C–D support.
Compression plus cups plus power-mesh, no hook-eye.
Maximum compression, high neck, wide locked band.
Full molded, underwire-channeled cups, hook-eye band.
Compression, encapsulation, and adjustable hook-eye together.
All nine cells run on our own cut-and-sew, molded-cup, and channeling lines — one dye batch across the range, no subcontracting, no cross-supplier color drift.
How an impact tier is actually chosen: breast displacement under load is what the tier controls. Walking and yoga produce small, mostly vertical movement — fabric compression alone manages it. Running and court sport drive multi-directional displacement that compression fabric cannot arrest at C-cup and above, which is why high impact moves to encapsulation: each breast is held in its own shaped cup, the band carries most of the load, and the straps fine-tune rather than suspend. Pick the tier by the sport and the top of your cup range, never by fabric weight alone.
Eight Wholesale Sports Bra Styles We Cut and Sew
A bra wall ordered from light to high support — each silhouette graded on real band×cup sizing and tooled for its impact tier before your branding ever touches it.
Strappy / Fashion-Back
Low impact · pull-on · removable pads · 200–240 GSM · DTC back detail.
Longline
Low–mid impact · longer band · removable pads · 210–250 GSM · crop crossover.
Seamless Molded
Low–mid impact · circular-knit, bonded edges · molded cup · 220–250 GSM.
Racerback
Mid impact · compression pull-on · power-mesh back · 220–260 GSM · training staple.
High-Neck Crop
Mid–high impact · high coverage · molded cup option · 240–280 GSM.
Zip-Front
High impact · front-zip on/off · molded cups + power-mesh side · 260–300 GSM.
Adjustable Encapsulation
High impact · molded cups + hook-eye band + adjustable straps · 280–320 GSM.
Nursing / Maternity
Specialty · clip-down cups + soft band · removable pads · 220–260 GSM.
The Cup and Band Build Behind Our High-Impact Sports Bras
Cup, pad, strap, and band are the structural buy decision for any high-impact sports bra manufacturer. Below are the cup molds, pad inserts, strap systems, and band closures we tool and sew on our own cut-and-sew lines (lines 5–9), molded-cup stations, and channeling line.
Cup & pad
- Molded contour cup — heat-shaped, holds its form wash to wash.
- Removable-pad pocket — sewn-in retention opening, no curl.
- Sewn-in spacer pad · wire-free support across every tier.
- Underwire channeling — encased, no poke, for high-impact encapsulation.
Strap systems
- Racerback · cross-back · classic adjustable · convertible.
- Wide cushioned straps — large-cup load spread.
- Reinforced strap anchor — no dig under high impact.
Band, closure & seams
- Pull-on band · structured underband · multi-row hook-eye.
- Power-mesh side panels and wings — large-cup stability.
- Flatlock · bonded heat-weld · coverstitch seams, no chafe.
Match your support tiers to fabric
Send your impact tiers and target fabric. Cup build, band closure, and grading recommendations land back with you the next working day.
Match my support tiers to fabricReal Band×Cup Grading for Wholesale Sports Bra Sizing
A 32A and a 38DD are not a small and a large of the same block. We grade band and cup as two independent axes, so your large cups fit like the sample instead of a stretched medium.
| Band \ Cup | A | B | C | D | DD |
|---|---|---|---|---|---|
| 30 | 30A | 30B | 30C | 30D | 30DD |
| 32 | 32A | 32B | 32C | 32D | 32DD |
| 34 | 34A | 34B | 34C | 34D | 34DD |
| 36 | 36A | 36B | 36C | 36D | 36DD |
| 38 | 38A | 38B | 38C | 38D | 38DD |
| 40 | 40A | 40B | 40C | 40D | 40DD |
| 42 | 42A | 42B | 42C | 42D | 42DD |
Two axes, graded separately
Band circumference is graded on one axis — underband length, wing depth, and closure rows. Cup volume is graded on a separate axis — cradle width, cup depth, and apex position.
- Proportional regrading of cradle, underband, wing, and strap anchor per cup size, not a single linear S–XL rule.
- Large-cup treatment (D, DD): wider wings, power-mesh side panels, wider cushioned straps, reinforced strap anchor.
Linear-grading a 38DD from a 34B block gives a gaping band, cup spillage, digging straps, and a rolling underband — structural failures concentrated in D, DD, and large-band sizes whenever both axes are graded on one rule.
The load path is the design: in a correctly built bra roughly the band, not the straps, does the supporting — which is why underband structure, wing depth, and closure-row count are graded on the band axis while cup depth and apex position move on the cup axis. When a factory grades both on one rule, the load path migrates to the straps as cup volume grows, and the wearer feels it as shoulder dig. Our sealed fit sample is checked on the body at the largest cup in your run, not only the base size.
Cup-Volume Engineering Step-Up — What Changes from B to DD
Cup volume drives the engineering change between sizes — not band length alone. Linear-grading from B to DD migrates the load path to the straps, and the wearer feels it as shoulder dig. This matrix is the step-up logic our pattern team applies as cup volume goes up, using capabilities already detailed in the cup and band build section above.
| Cup range | Cradle | Wing depth | Side panel | Strap width | Strap anchor | Hook-eye rows | Cup / channel build |
|---|---|---|---|---|---|---|---|
| A–B | Base | Base | Optional | Base | Single-stitched | 2 rows | Molded cup, wire-free |
| C | Widened | Widened | Recommended | Base | Reinforced | 2–3 rows | Shaped molded cup |
| D | Widened+ | Deeper | Power-mesh required | Cushioned | Double-stitched | 3 rows | Structured molded cup |
| DD | Widened++ | Deepest | Power-mesh + wings | Wide cushioned | Double-stitched, reinforced | 3–4 rows | Encapsulation, underwire channeling optional |
| 38+ large band | Proportional | Proportional | Reinforced wings | Wide | Reinforced | 4 rows | Channeled underwire standard |
Cup volume drives roughly the majority of the engineering change between sizes; band-axis changes (underband length, wing depth, closure-row count) handle the remainder. When a factory grades both axes on one rule, the load path migrates to the straps as cup volume grows. The pattern-side workflow lives in tech-pack & pattern; sample-acceptance specifics are on the FAQ.
Fabric and Support Specs — From Seamless to Compression Sports Bras
From a seamless sports bra manufacturer’s circular-knit to a compression sports bra supplier’s power-mesh, every impact tier is mapped to its fabric, GSM, stretch, and support build — rolls are weight-tested, elongation-tested, and shade-instrumented in our in-house lab room before release to the cutting tables.
| Impact tier | GSM | Spandex | Stretch | Support construction | Power-mesh panel | Fabric | Wicking |
|---|---|---|---|---|---|---|---|
| Low | 200–240 | 10–14% | 55%+ | Compression / light molded | Optional | nylon-spandex, recycled-poly elastane | High |
| Medium | 220–260 | 14–18% | 60%+ | Compression / combination | Back panel | poly-spandex, power-mesh | High |
| High | 260–320 | 16–20% | 65%+ | Encapsulation (molded + channeled) / combination | Side panels + wings | poly-spandex + power-mesh, bonded | High |
| Seamless | 220–250 | 16–20% | 70%+ | Molded one-piece, bonded edges | Knit-in | nylon circular-knit | High |
Every roll that arrives for a bra run is lab-checked against this matrix — weight, elongation, and compression retention — and shade-matched by instrument before release to the cutting tables.
OEM Sports Bra Factory: OEM, ODM, and Private Label Sports Bra Production
Bras are the most construction-heavy garment in activewear, so the right question is: who owns the structural engineering — you, us, or the blank?
OEM (Cut-and-Sew)
Your tech-pack, our cut-and-sew, molded-cup, and channeling lines, full custom control as an OEM sports bra factory.
When the support structure is your own design.
View OEM process →ODM (Our Blocks)
Our graded bra blocks across all three support tiers — you change fabric, color, pad, and label.
When you want proven cup tooling under your styling.
View ODM options →Private Label Sports Bras
Our existing bra blanks, your hangtag, care label, and packaging.
When the shelf date is the deadline.
View private label →Customization: support tier + cup build (molded / removable pad / underwire) · Pantone color match (ΔE ≤1.5) · sublimation / DTG / silicone / reflective print · woven label, hangtag, and polybag kit.
On quantities and timing: structured cup tooling does not change the entry point — bras follow the same factory-wide order terms as every category, and those figures are published once, on the FAQ.
Sampling and product family: a wearable pre-production sample at the largest cup in your run is USD 45 per piece, returned in 5 working days on stock fabric or 12 working days on custom fabric — full workflow on small-batch sampling. Sports bras sit within our Training & Performance product family; matched-set legging, short, and compression specs are documented there.
Sports Bra Manufacturing — Questions Buyers Ask
What buyers checking a new bra supplier ask about support construction, cup builds, and sizing.
Do you make high-impact encapsulation bras in-house, or just compression pull-ons?
Both. We build all three support tiers on our own floor — compression pull-ons, combination bras, and full encapsulation with molded cups, underwire channeling, and hook-eye bands. Cup tooling and channeling are in-house, so your whole bra range runs through one dye batch with no subcontracting and no cross-supplier color drift.
Do you grade real band×cup sizes, or only S–XL?
Real band×cup. We grade band 30–42 and cup A–DD as two independent axes, with proportional cradle, wing, underband, and strap-anchor regrading per cup volume. Large cups get wider wings, power-mesh side panels, and wider straps, so a 38DD fits like the sample instead of a stretched medium.
Are longline and racerback bras made in-house?
Yes. Longline, racerback, strappy, seamless, high-neck, zip-front, encapsulation, and nursing are all cut and sewn on our own floor. Seamless runs on a circular-knit line; the structured styles run on cut-and-sew with molded-cup tooling — all under one roof, one dye batch.
How do you build the cup — molded, removable pad, or underwire?
All three. We tool molded contour cups, sew removable-pad pockets with retention openings, and channel underwire for high-impact encapsulation. Wire-free support is available across every tier. Tell us the support level and we recommend the cup build, or build exactly to your tech-pack.
Is the order entry split across my band×cup range, or counted per size?
Split across the range — one per-style total, distributed over your band×cup matrix however your demand curve looks, with no separate floor per size. A hook-eye encapsulation style and a pull-on bralette share identical order terms; see the FAQ for the figures themselves.
What do I get to approve before a bra goes to bulk?
A wearable pre-production bra at the largest cup in your run: support level under bounce, cup shape, band tension, strap comfort, fabric, and shade all get signed off on that piece, and bulk is inspected against it. Without a largest-cup check, the sizes most likely to be returned are the ones never fitted.
How consistent is color across reorders?
We hold Pantone color to ΔE ≤1.5 and read a spectrophotometer value per fabric lot in your pre-shipment package. Your reorder black matches your first-order black — and matches the legging you ordered in the same batch, so a coordinated bra-and-legging set stays consistent.
Can I private-label sports bras without engineering them myself?
Yes — our bra blanks span all three support tiers with the cup tooling, channeling, and band work already validated, and your woven label, hangtag, and packaging make them yours. Name the support tiers you want to carry and we match blanks to them.