Detailed Explanation:

Kevlar is a synthetic aramid fibre developed by DuPont in 1965, known for its extremely high tensile strength (5 times stronger than steel by weight) and low weight.

Its unique properties include bullet energy absorption and dispersion, flexibility, heat resistance, and fire resistance, making it the preferred material for lightweight bulletproof helmets and jackets. Terylene and Nylon lack the necessary impact resistance for ballistic protection.