Compression Decay Solutions for Sports Bras: Common Failure Causes and Fixes
Below are the failure patterns most often seen when compression decay affects technical sports bras, with the correction for each.
Failure: hidden until worn
the garment loses its support value over the wearing life usually appears after several sessions. Because it develops slowly, it reaches the customer instead of the inspection table. Because the underband and strap anchors carry repeated load, target checks are made on a worn sample rather than flat fabric alone.
Cause one
elastane fatigued by excessive heat during setting. Keep ISO 13934-1 tensile with cyclic extension named in the tech pack so every lot is measured the same way.
Cause two
repeated extension beyond the design range. Where technical sports bras is worn for everything from yoga to high impact training, set tolerances around that range of movement.
Cause three
poor recovery after chlorine or oil exposure. Any change to power mesh and bonded spacer panels requires re-testing against above 90% elastic recovery after 20000 cycles before bulk is released.
Correction and prevention
Apply keep setting below the elastane degradation temperature first, then verify against above 90% elastic recovery after 20000 cycles using ISO 13934-1 tensile with cyclic extension. Lock the corrected settings into the bulk recipe so repeat orders behave identically. Past reports from ISO 13934-1 tensile with cyclic extension help the mill reproduce the same recipe on the next order.
