The N-Ferno 6952 Winter Hard Hat Liner features three layers of insulation, with a quilted shell, foam mid-layer and sherpa lining for enhanced warmth and comfort. This lightweight shoulder-length thermal liner is extra long to keep head, ears and neck covered while fitting comfortably under helmets or hard hats without bulk. The quick-drying polyester sherpa lining delivers all the benefits of real sheep's wool to keep wearers warm without bulk or discomfort. Also features a quilted nylon shell. 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 against the face to trap body heat in and keep cold out. Small pockets by the ears are designed to hold regular-sized hand warmers (sold separately) to keep ears warm and comfortable in extreme temperatures.