Heat Holders Thermal Hat with Pom Pom: These mens Heat Holders bobble hats have a plush fleece insulating lining, called Heatweaver, that is even more effective at holding warm air in that regular lining. This silky, soft lining doesn't just feel luxurious, it also assures you of warm ears in the harsh winter. This all is made with the Heat Holders Yarn which is expertly made in order to keep you nice and warm, with its superior moisture wicking abilities and keep all the cold out. All these features g... - Manufacturers part number: Heat Holders_HHMBOBGrey_MP-5564