SEIRUS UNISEX HEATWAVE SKULL LINER WINTER HAT

Thin, lightweight, and warm. The Heatwave™ Skull Liner is warm enough to wear alone and layers seamlessly under hats and helmets. The revolutionary dual heating system found in the Heatwave™ lining reflects and amplifies your body’s heat to produce that warm cozy feeling we all look for. Recommended for: on-mountain use, all-day backcountry expeditions, and a wide range of other outdoor activities.