Copper Ion Yarn for Sports Bras: Buyer Guide
Buyers sourcing medium support sports bras with real odour control usually ask the same five questions. Here is how we answer them for Copper Ion Yarn.
How does it actually work
Copper Ion Yarn relies on copper-bearing filament or finish. In practice copper damages bacterial cell walls and also improves thermal transfer. If a supplier cannot explain the mechanism in one sentence, they are probably selling a fragrance that washes out in three cycles. The sweat zone for medium support sports bras is the underband and the centre front panel, which is where the treatment has to sit.
What target should I write
Write bacterial reduction above 98% with improved thermal diffusion measured by AATCC 100 antibacterial test. Naming the standard matters more than the headline number, because antibacterial results are not comparable across different test methods. Every lot is measured against AATCC 100 antibacterial test before the fabric is released for cutting.
How long will it last
Expect 30-50 washes depending on construction under normal care. Ask for results after washing rather than only as delivered, and make the care label say avoid bleach and dry away from direct heat. Cost impact is USD 0.45-0.75 per garment, which is usually recovered through fewer returns across a season.
What does it cost
Budget USD 0.45-0.75 per garment. Against the cost of a returned garment and a lost repeat customer, that is a modest amount, and it is easier to defend than a price rise later. Wear trials were run under gym work, running and studio practice rather than in the laboratory alone.
How do I check a shipment
Take fabric from the bulk lot, not the sample book, and repeat AATCC 100 antibacterial test. Keep the report with the shipment documents so any claim can be answered with data instead of opinion. The care label states avoid bleach and dry away from direct heat, and that wording is the condition behind 30-50 washes depending on construction.
