The latest breakthrough in barrier protection for firefighter hoods VIKING’s new triple-layered hoods help protect your neck, ears and jaw area from dangerous particles. Between layers of comfortable viscose, we have added a paper-thin layer of DuPont™ Nomex® Nano Flex, which acts as a protective barrier against particles without compromising comfort. Thinner and lighter than other FR materials, it’s a highly breathable, flame-resistant (FR) material with superior particle barrier performance.