Why do some activewear fabrics lose elasticity over time?

Activewear fabrics lose elasticity primarily due to frequent washing, heat exposure, chemical breakdown from sweat, oils, and detergents, and consistent stretching during use. Spandex or elastane fibers, responsible for elasticity, gradually weaken when exposed repeatedly to harsh conditions. Proper care routines can significantly slow this process.
Why are thin polyester gym clothes so expensive?

Thin polyester gym clothes are expensive due to advanced moisture-wicking technologies, branded performance fabrics, durable construction, anti-odor treatments, sustainable manufacturing practices, R&D investments, and brand positioning. These high-tech features and premium attributes significantly enhance comfort, performance, and longevity, justifying their cost.