Sports Bra Manufacturer
A sports bra is a support garment before it is a fashion item. Underband tension, strap attachment and cup construction determine whether it holds — and whether it gets returned.
Match the construction to the impact level
Low impact (yoga, pilates): light support, often unlined or with removable pads, minimal underband. Medium impact (training, cycling): wider underband, racerback or cross-back, bonded or flatlock seams. High impact (running, HIIT): encapsulated or moulded cups, wider straps, hook-and-eye or adjustable closure, firmer underband.
Selling a low-impact bra into a running audience is a returns problem, not a design problem. We ask what activity the bra is for before recommending a construction.
Underband and strap engineering
The underband carries most of the support. Its tension, width and recovery are specified per size, not one elastic for the whole range — a band that supports a 34B will ride up on a 38DD.
Strap attachment is the second failure point. Narrow straps with a single stitch at the apex will fail under load; we specify bartack or multi-stitch attachment and test it.
Padding, moulding and finishing
Removable pads are the cheapest route and the most common source of customer complaints when they fold in the wash. Sewn-in moulded cups cost more but eliminate that complaint and photograph better.
Bonded edges give a clean seamless look but require a specific fabric and a controlled process; not every knit bonds reliably, which is why we test before quoting a bonded construction.
Support level decides the construction, not the other way round
Low support is a compression garment with a simple elastic band and thin straps. Medium support adds a wider underbust band, a racerback or crossed straps, and often removable pads. High support needs either encapsulation (separate cups that hold each breast) or a genuinely wide, non-stretch band with a hook-and-eye closure — plus straps that do not elongate under load.
The most common failure is a bra designed as low support and sold as medium. It looks right, tests fine on a hanger, and fails when worn. If the product claims support, the construction has to deliver it: band width, strap elasticity and cup seaming all have to be specified for that claim.
Pads are their own decision. Removable pads need a pocket opening with a finished edge that survives washing; moulded pads need a cup shape tooled per size. Fixed pads remove the customer complaint about pads folding in the wash and add cost and packing complexity.
Test what you claim. A jump test on a range of cup sizes tells you more than any measurement table, and it is the test a customer performs informally on the first wear.
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