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Fabric flutter is rapid airflow-induced flapping in lightweight sportswear that can affect comfort, noise, drag and garment stability.

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.

Surface texture, seams and garment fit can change airflow around polyester sportswear and influence aerodynamic drag at higher speeds.

Strike-through measures how quickly liquid moves away from the skin side, while rewet indicates how much moisture returns under pressure.

Radiant heat emissivity describes how effectively a polyester surface emits infrared energy, with colour, texture and finish influencing heat exchange.

Fabric buckling occurs when compressive forces make a thin polyester textile become unstable and form waves, folds or wrinkles.

Repeated stretching can gradually weaken polyester fabric even when no tear is visible, making cyclic tensile fatigue important for high-movement garments.

Thermal expansion describes dimensional change caused by temperature. In polyester textiles, yarn orientation, heat setting and construction strongly affect the final response.

Thermal diffusivity describes how quickly a temperature change moves through polyester fabric, influencing transient comfort and heat response.