Nylon: You'll often find nylon in activewear. However, nylon is 100% synthetic, so it's an impractical choice for those who sweat heavily. Nylon isn't breathable and will trap heat and moisture easily, making you sweat more.
What fabric is bad for sweat?
Cotton Versus Polyester
To avoid trapping your perspiration and intensifying the issue, opt for clothing that is made of a lightweight cotton fabric, whether it's a dress or top. It really is the fabric of our (sweaty girl) lives. DO: Wear cotton whenever possible.
Is nylon good to wear in hot weather?
As a fully synthetic material, nylon is the opposite of breathable. Because it's designed to repel water and has a low level of absorption, clothing made from nylon tends to trap heat and sweat against the skin.