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Polyester knitted fabric contains thousands of open spaces between filaments, yarns and loops. Learn how fabric porosity affects airflow, drying, moisture management, opacity and garment comfort.

Polyester is dimensionally stable, but knitted fabric can still shrink or grow due to loop relaxation and finishing tension. Learn how heat setting, overfeed, loop density and washing influence final fabric dimensions.

Courses and wales determine how closely loops are packed in polyester knitted fabric. Learn how loop density affects GSM, opacity, airflow, stretch, stability and finished fabric appearance.