Stay warm and protected in this hard hat liner. Made of 9-ounce, 100 percent cotton fr twill with an 11.7-ounce polartec power stretch fabric lining. There are inside warming pouch pockets over the ears, and a lower front closure to keep out wind and protect the neck. Meets the performance requirements of nfpa 70e. 11.7-ounce polartec power stretch fabric lining. Protects ears and neck nfpa 70e