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Apparent density relates fabric mass to its overall volume, helping explain why two polyester fabrics with the same GSM can feel very different in thickness and bulk.

Yarn crimp contraction explains how textured polyester yarn develops bulk, stretch and recovery after relaxation or heat, changing fabric feel and performance.

Why can two polyester fabrics with the same GSM feel completely different in thickness and fullness? Learn how DTY crimp, yarn texture, loop structure and finishing create fabric bulk without adding much extra weight.

What is crimp contraction in polyester DTY? Learn how false-twist texturing creates crimp and why crimp level controls yarn bulk, fabric cover, stretch, thickness and softness.