What fabric specs matter most for sports bra support?
The three most important fabric specs for sports bra support are fabric power (modulus), controlled stretch percentage, and recovery rate. These directly determine bounce control, on-body comfort, and whether the support structure stays stable after repeated wear and washing. Measured at specific elongation points (e.g., 30–50% stretch), modulus indicates how much force is needed to stretch the fabric. Higher modulus = greater resistance = more bounce control. This is critical for high-support designs. Support fabrics should stretch just enough for comfort and movement, but not beyond what the structure can control. Typical ideal stretch ranges vary by garment zone and are validated during sampling. After stretching to a defined limit (e.g., 50,000 cycles), the fabric should return to near its original dimensions. Poor recovery leads to bagging, band creep, and lost support over time. Repeated stretch-and-release cycling simulates real wear. Elastic fatigue testing reveals how much support a fabric will retain after weeks or months of use and washing. Need help selecting support fabric for your sports bra? Tell us your target support level and we will recommend the right specs.Key Fabric Specs Explained
Fabric Power (Modulus)
Controlled Stretch
Recovery Rate
Elastic Fatigue Resistance
How These Specs Affect Performance
Spec Low Impact Medium Impact High Impact Modulus @ 30% Sofft, flexible Moderate resistance Firm, high resistance Stretch % Higher stretch Moderate stretch Controlled, lower stretch Recovery > 90% > 93% > 95%
