Double Knit Interlock Fabric

A1: These are generally known as spandex whitening, warp streaks or weft bars. Spandex whitening occurs because spandex and nylon/polyester have different dye uptake rates, which becomes visible under certain lighting. Warp streaks and weft bars result from uneven yarn quality or weaving defects.

Please provide photos and the corresponding roll numbers if you encounter such issues, and we will conduct an immediate inspection. For recurring defects, we will file quality claims in accordance with quality inspection standards.

A2: This issue is usually not caused by broken spandex filaments, which would only lead to localized loss of resilience. The more common cause is spandex elastic fatigue. Just like a rubber band that stretches out after long-term use, repeated stretching, especially high-temperature washing and drying, will temporarily relax the molecular structure of spandex. We recommend hand-washing in cold or lukewarm water, avoiding tumble drying, and laying the fabric flat to air dry. Its elasticity can usually be partially restored.

A3: This phenomenon is called frosting. Long-term local friction flattens the microscopic structure of fiber surfaces and increases light reflection. It is not actual color fading, but physical wear. Though nylon features good wear resistance, frosting cannot be completely avoided and is regarded as normal wear marks. Fabrics with textures such as matte finish, twill and jacquard can effectively reduce this issue.