Frigid temperatures won't prevent a successful day on the job when wearing this Occunomix Hard Hat Liner with a mouth guard. Snug fitting to keep body heat in and the cold out, the liner is equipped with two layers of DuPont Sherpa lining and is made with insulated Ear Barriers for extra protection against the elements. Made to fit to the shoulders, the liner easily fits under a hard hat and coat, or other outerwear.