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Why do polyester-Lycra fabrics with the same GSM behave differently after washing or stretching? Heat setting may be the reason. Discover how temperature, fabric tension and stenter overfeed influence shrinkage, width, GSM and elastic recovery—and why incorrect finishing conditions can create costly garment-quality problems.

Why do polyester-Lycra leggings become loose around the knees even when they do not shrink? The answer may be fabric growth, a lesser-known textile property linked to incomplete elastic recovery. Learn how fabric growth occurs, how it is measured and what manufacturers can do to improve stretch-fabric shape retention.