What kind of metal are kevlar and polyester?

Kevlar and polyester are not metals; they are synthetic fibers. Kevlar is an aramid fiber known for its high strength-to-weight ratio and is commonly used in bulletproof vests and protective gear. Polyester, on the other hand, is a versatile fabric often used in clothing and textiles due to its durability and resistance to wrinkles and shrinking. Both materials are widely used in various applications due to their unique properties.