Stay Warm - Air Activated Heated Hard Hat Liner w/Two Ear Warmer Packs - EACH Keep heads and necks protected from the cold; attach directly to hard hats (not included). Soft, durable, 100% poly-fleece w/black cotton-poly elastic trim for snug fit, hook & loop closure and hard hat attachments, and built-in Warmer pockets over ears. Sizes: One Size Colors: Black. Include one (1) pair of HeatPax Mini/Hand Warmers (5550) for up to 8 hours of heat to get you through a long work day in the bitter cold