Heat Holders® roll-up hat is exceptionally thermally effective, with a new heatweaver® plush insulating liner that has been developed to hold even more heat in.Features: Moisture WickingBase Material: 100 AcrylicLining: Fully LinedLining Material: PolyesterCare: Line Dry, Hand Wash, Machine Wash, Dry FlatCountry of Origin: Imported Heat Holders Mens Beanie