Thermatek Thermagear Wind and Water-resistant Men's Heated Hat With TRI-LON PLUS Advanced Soft Shell Fleece- Includes 2 Heat Packs TRI-LON PLUS advanced soft shell fleece provides breakthrough for the first time in outerwear products Wind Resistant for enhanced warmth and water resistant for moisture protection in all elements Concealed heat zone pockets keep the heat packs in and your head warm Set of 2 heat packs included provide controlled, targeted heat for up to 8 hours 9.18x1.47x8.52