Polyester has many endocrine-disrupting chemicals like phthalates, bisphenol A (BPA), and flame retardants that can lead to hormal changes, a reduction in sperm quality, and lower testosterone. 

When you wear polyester you are essentially wearing plastic. This leads to microplastics shedding from your clothes and can find their way into your body. Once inside, they can accumulate and contribute to health problems.

Polyester is loaded with toxic dyes and chemicals. When rubbing on your skin, unlike natural fabrics, polyester doesn't allow the skin to breathe. This lets heat and moisture get trapped, causing skin irritations like acne, rashes, itching, eczema, and redness.