GOTS Certification How It Changes with Construction and Elastane Content
GOTS Certification does not stay constant when construction changes. Understanding the direction of change helps during development.
Effect of knit structure
Loop length and density move results first, usually before any yarn change is made. Working figures for GOTS Certification normally sit around minimum 70% organic fibre in mainstream production. Note Control Union or equivalent audit on the tech pack so nobody tests against an older revision.
Effect of elastane content
More elastane raises recovery but changes the value measured by Control Union or equivalent audit, so retest after any blending change. Record elastane content alongside GOTS Certification, because blends shift the measured value. A result outside minimum 70% organic fibre usually points to process drift rather than to the fibre itself.
Effect of finishing
Heat setting and softeners shift results, which explains differences between a hand sample and bulk. Keeping reference values for GOTS Certification lets suppliers quote without extra sampling rounds. Ask for conditioning details together with Control Union or equivalent audit, since both affect the reading.
Typical range
Working values stay around minimum 70% organic fibre for mainstream activewear. Working figures for GOTS Certification normally sit around minimum 70% organic fibre in mainstream production. Note Control Union or equivalent audit on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against Control Union or equivalent audit before moving to the next sample round. Record elastane content alongside GOTS Certification, because blends shift the measured value. A result outside minimum 70% organic fibre usually points to process drift rather than to the fibre itself.
