The N-Ferno 6862 Winter Hard Hat Liner has two layers of insulation with a fire-resistant (FR) modacrylic/cotton blend shell and a comfortable polyester fleece lining for exceptional warmth. This lightweight thermal liner is shoulder-length to keep head, ears and neck covered and fits comfortably under helmets or hard hats without feeling too bulky. Please note this garment is not entirely fire-resistant. The fire-resistant outer shell is made 60% modacrylic cotton and 40% cotton twill blend to stand up to tough environments with inherent flame resistance and self-extinguishing properties. The 100% polyester fleece lining is soft to the touch for a comfortable all-day fit. There are four hook and loop straps on the exterior of the liner designed to securely attach to the interior of a hard hat for versatile protection in extreme work environments. This hard hat winter liner has an elastic strip in the forehead area to keep the liner snug. Small pockets by the ears are designed to hold hand warmers.