The N-Ferno 6840 Winter Hard Hat Liner features two layers of insulation, with a water-resistant shell and soft polyester fleece lining for comfortable warmth. This lightweight chin-length thermal liner keeps head and ears covered while fitting comfortably under helmets or hard hats without bulk. The PU-coated polyester shell is water-resistant with a durable finish that resists corrosion and abrasion. The 100% polyester fleece lining is incredibly soft for comfortable all-day wear.</