In addition to simplicity-of-use and ease-of-identification, the X Series sets a new standard in design, comfort and protection for over-the-ear protection. X4 Earmuffs protect against moderate-to-heavy industrial noise. The extremely slim and lightweight ear cups provide excellent compatibility when used with other personal protection products. A newly-designed spacer improves attenuation, without a double cup design. The specially-formulated damping pads combine with the innovative foam contained in the sealing ring to provide excellent acoustic protection, particularly against sounds dominated by low frequencies. Design of neckband allows earmuffs to be worn with a variety of face shields and headgear. The backbanded earmuff features an electrically insulated (dielectric) wire.